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Find the 6th term in the expansions of (2x-y)whole squar

Posted by Gautama Singh Singh 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Shaina Rajput 6 years, 10 months ago

I think question is wrong coz the possibile terms in the expansion is 3. So, how can we find 6th term

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Show that the following statement is grue by the methord by contrapositive "If x is an integer and x^is even then x is also even

Posted by Ansh Kukreja 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Gaurav Seth 6 years, 10 months ago

The component statements of given statement are:
q : x is an integer and x² is even
r : x is an even integer.
In method of contrapositive,
We assume that ~r is true and we have to prove that ~q is also true.
Now, ~r is true,
Therefore, x is not an even integer or x is an odd integer.

or x = 2n + 1 for some integer n.
or
or
or
or is an odd integer.
or q is false.
or ~q is true.
Thus,
Hence, the given statement p is true.

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7.5 2n-1 +2 3n-1 is divisible by 17 for every natural number n >=1

Posted by Narendra Nath Sarangi 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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f(x)=x-1/x+1 then prove that f(2x)=3f(x)+3/f(x)+3

Posted by Megha Kumari 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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Write the value of 1000c1

Posted by Vikas Kumar 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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If f(x+1/x)=x^2+1/x^2 then find f(x)

Posted by Ayushi Priya 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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Write the value of sin(pi/12).sin(5pi/12)

Posted by Anuj Singh 5 years, 3 months ago

CBSE > Class 11 > Mathematics

1 answers

Ansh Kukreja 6 years, 10 months ago

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Sec2A +cosec2A>_4

Posted by Amit Gupta 6 years, 10 months ago

CBSE > Class 11 > Mathematics

0 answers

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co^2+c1^2+c2^2.....+cn^2 = 2n!/(n!)^2

Posted by Yash Gupta 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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2#2

Posted by Harshita Jha 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Shaina Rajput 6 years, 10 months ago

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If A and B be the point (3,4,5) and (-1,3,7) ,respectively, find the eqution of the set of point P such that PA^2+PB^2=K^2 . Please answer my question

Posted by Talib Gazi 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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Limit tending to o tanX upon sin 3x

Posted by Govind Pathak 6 years, 10 months ago

CBSE > Class 11 > Mathematics

2 answers

Mohit Shrivastav 6 years, 10 months ago

Divide numerator and denominator by x , Then ==> limit x->0 tanx/x/sin3x/x ==> lim x->0 1/sin3x/x (lim y-->0 tany/y=1) Now multiply and divide denominator by 3 ==> lim x->0 1/sin3x*3/x*3 ==> lim x->0 1/1*3 (lim y-->0 siny/y=1) ==> 1/3 I hope, this will help you.

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Lokesh Chayal 6 years, 10 months ago

1/3

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tanx+2tan2x+4tan4x+8cot8x=cotx

Posted by Loveleen Jouhal 6 years, 10 months ago

CBSE > Class 11 > Mathematics

2 answers

Aman Kumar 6 years, 10 months ago

Wel explained answer.. thanks

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Shaina Rajput 6 years, 10 months ago

First, its important to find the value of tan x – cot x. So, tan x – cot x = tan x - 1/tan x = tan² x-1/tan x = -2 (1-tan² x/ 2tan x) = -2 ( 1/2tan x ÷ 1- tan² x) = -2× 1/tan² x = 2cot 2x ....(1) . Now— tan x + 2 tan 2x + 4 tan 4x + 8 cot 8x = tan x – cot x + 2 tan 2x + 4 tan 4x + 8 cot 8x + cot x = –2 cot 2x + 2 tan 2x + 4 tan 4x + 8 cot 8x + cot x = 2 (tan 2x – cot 2x) + 4 tan 4x + 8 cot 8x + cot x = 2 (– 2 cot 4x) + 4 tan 4x + 8 cot 8x + cot x = 4 (tan 4x – cot 4x) + 8 cot 8x + cot x = 4 (– 2 cot 8x) + 8 cot 8x + cot x = – 8 cot 8x + 8 cot 8x + cot x = cot x . Hence, tan x + 2 tan 2x + 4 tan 4x + 8 cot 8x = cot x

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Find square root of -15-8i

Posted by Raghav Sharma 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Mohit Shrivastav 6 years, 10 months ago

Let the sq. root of √ -15-8i=+-(x+iy) On Sq. both sides we get, -15-8i=x^2+(yi)^2+2xyi -15-8i=^2-y^2+2xyi (i^2=-1) on comparing, we get, =x^2-y^2=-15 ........(1) 2xy=8 We know that (x^2+y^2)^2=(x^2-y^2)^2+(2xy) ^2 On putting the values, we get (x^2+y^2)^2=(-15)^2+(8)^2=279 (x^2+y^2)=17 .........(2) On solving (1)and(2),we get X=+-(1),y=+-(4) Hence, √-15-8i=+-(1+4i)

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Find the mumber of words with or without meaning which can be made using all letters of the word AGAIN. If these words are written as in s dictionary what will be the 50th word?

Posted by Priyanshu Aggarwal 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Ayush Pandey 6 years, 10 months ago

NAAIG

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Har ek chapter se kitne marks ka aayega? pls batao koi !!

Posted by Kratos Jskfkg 6 years, 10 months ago

CBSE > Class 11 > Mathematics

2 answers

Ayush Pandey 6 years, 10 months ago

Sb me thoda pr trigo 7, 8 and 14 is most important

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Ashish Kumar 6 years, 10 months ago

1 to 27

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The second, Third, fourth, terms in expansion of (x+y)n are 240, 720, 1080. Find value of x, y, and n.

Posted by Abhishek Kumar 6 years, 10 months ago

CBSE > Class 11 > Mathematics

0 answers

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Sample space

Posted by Aman Pandey 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Anuj Singh 6 years, 10 months ago

The total no. Of event can happen.

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if |x|<1 and y=x+x²+x³+.... show that x=y/1+y ?

Posted by Shivam Srivastav 6 years, 10 months ago

CBSE > Class 11 > Mathematics

0 answers

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Derive the value of sin18

Posted by Vikas Maurya 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Nikhita V 6 years, 10 months ago

Let A = 18. Then Sin 5A=1 which means that sin (2A+3A)=1. Put the formula and solve

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Sin18°=?

Posted by Saurav Singh 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Shaina Rajput 6 years, 10 months ago

Let A = 18° Therefore, 5A = 90° ⇒ 2A + 3A = 90˚ ⇒ 2θ = 90˚ - 3A Taking sine on both sides, we get sin 2A = sin (90˚ - 3A) = cos 3A ⇒ 2 sin A cos A = 4 cos^3 A - 3 cos A ⇒ 2 sin A cos A - 4 cos^3A + 3 cos A = 0 ⇒ cos A (2 sin A - 4 cos^2 A + 3) = 0 Dividing both sides by cos A = cos 18˚ ≠ 0, we get ⇒ 2 sin θ - 4 (1 - sin^2 A) + 3 = 0 ⇒ 4 sin^2 A + 2 sin A - 1 = 0, which is a quadratic in sin A Therefore, sin θ = −2±−4(4)(−1)√2(4) ⇒ sin θ = −2±4+16√8 ⇒ sin θ = −2±25√8 ⇒ sin θ = −1±√5/4 Now sin 18° is positive, as 18° lies in first quadrant. Therefore, sin 18° = sin A = −1±√5/4

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f(x)=cos(x-π/16) find derivative

Posted by Om Verma 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

T S 6 years, 10 months ago

f'(x) =d/dx[cos(x-pi/16)] =-sin(x-pi/16){d/dx(x-pi/16)} =-sin(x-pi/16){1-0} =-sin(x-pi/16).......ANS

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If is smaller than right the length of the latest rectum of the ellipse

Posted by Shimpi Kumari 6 years, 10 months ago

CBSE > Class 11 > Mathematics

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write the domain of the following function : f(x)= 1/√(x+1)(2x-5)

Posted by Anisha Sharma 6 years, 10 months ago

CBSE > Class 11 > Mathematics

3 answers

Sb Junaid 6 years, 10 months ago

Domain can only be 3 or more than 3

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Nikhita V 6 years, 10 months ago

Use wavy curve method

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Anisha Sharma 6 years, 10 months ago

koi answer krdo...??

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Find the area of the triangle ABC with the coordinates of A as. (1,-4). and the coordinates of the mid points of the sides AB and AC respectively are (-2,1) and (0,-1).

Posted by Babita Kumari 6 years, 10 months ago

CBSE > Class 11 > Mathematics

0 answers

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how many square tiles of side 40 cm needed to build length 29 m and breadth 6 m

Posted by Yashwant Pradhan 6 years, 10 months ago

CBSE > Class 11 > Mathematics

1 answers

Anamika Gupta 6 years, 10 months ago

Total needed area=l*b =29*6=174m sq. Change it into cm=174*100=17400cm sq. Now find the area of square tile=40*40=1600cm sq. Total square tiles needed=17400/1600 =10.87ans.

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33+33

Posted by Ragraj Singh Chauhan 6 years, 10 months ago

CBSE > Class 11 > Mathematics