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Prove that sin^2 18°+cos^² 36°=3/4

Posted by Ashu Sheoran 8 years ago

CBSE > Class 11 > Mathematics

3 answers

Rohan Gupta 8 years ago

We can also do this without actually knowing the values

1Thank You

Saloni Kumari 8 years ago

sin18°=√5-1/4 & cos36°=√5+1/4 putting this values above we get (√5-1/4)^2+(√5+1/4)^2=3/4

0Thank You

Saloni Kumari 8 years ago

sin18°=√5_1/4 & cos36°=√5+1/4 putting this values above we get (√5-1/4)^2+(√5+1/4)^2 =3/4

1Thank You

ANSWER

In a survey of 60 people, it was found that 25 people read newspaper H , 26 read newspaper T , 26 read newspaper I , 9 read both H and I , 11 read both H and T , 8 read both T and I , 3 read all three newspapers . Find : (i) the number of people who read at least one of the newspapers (ii) the number of people who read exactly one newspaper.

Posted by Rima Das 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

In cricket match , a batswoman hits a boundary 6 times out of 30 balls she plays .find the probability that she did not hit a boundary .

Posted by Jyoti Madheshiya 8 years ago

CBSE > Class 11 > Mathematics

7 answers

Medhavi Singh 8 years ago

4/5

1Thank You

Joya Chatterjee 8 years ago

1/5

0Thank You

Diya Zehra 8 years ago

1/5

0Thank You

Lalita Kumari 8 years ago

4/5

1Thank You

Ankit Paswan 8 years ago

4 /5

1Thank You

Gaurav Bansal 8 years ago

4/5

2Thank You

Harsh Maurya 8 years ago

1/5

4Thank You

ANSWER

What are the main questions of r marks in straight line

Posted by Hritik Singh 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

What are the main questions for straight lines 6marks question

Posted by Ruhan Malik 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Sum the series 1+3+7+15+.......upto n terms

Posted by Dipsmita Chattopadhyay 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Find the derivative of sin2x from first principle method

Posted by Rutu Gond 8 years ago

CBSE > Class 11 > Mathematics

1 answers

Lalita Kumari 8 years ago

F(x)=sin2x ,F(x+h)=sin2x+2h, put formula and put c-d formula

3Thank You

ANSWER

What is derivative of cosec x

Posted by Ct Tidke 8 years ago

CBSE > Class 11 > Mathematics

4 answers

Lalita Kumari 8 years ago

-cosecx.cotx and sorry pehle vale Ans ke liye

1Thank You

Mayank Lakhina 8 years ago

-cosec xcotx

1Thank You

Lalita Kumari 8 years ago

Sec²x

1Thank You

Aman Rawat 8 years ago

_cossecxcotx

1Thank You

ANSWER

Find sinx/2,cosx/2 and tanx/2 in sin x=1/4 and x is in 2nd quadrant

Posted by Ajay Singh 8 years ago

CBSE > Class 11 > Mathematics

3 answers

Joya Chatterjee 8 years ago

It's tanx/2=-2\^15

0Thank You

Joya Chatterjee 8 years ago

Sin x/2=1/2, cos x/2= - ^15/2, tanx/2= 2\^15

0Thank You

Nadeem Abbas 8 years ago

Thank you

2Thank You

ANSWER

Prove that tan 7A-tan5A-tan2A=tan7A tan5A tan2a

Posted by Har Preet 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Using binomial theorem,prove that 6 the power n -5n always leaves the remainder 1 when divided by 25.

Posted by Har Preet 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Cos20cos40cos60cos80=?

Posted by Gouse Ahmed Niazi 8 years ago

CBSE > Class 11 > Mathematics

1 answers

Nadeem Abbas 8 years ago

Sin 200x

0Thank You

ANSWER

Factories 1-256x4

Posted by Fannana Mazumder 8 years ago

CBSE > Class 11 > Mathematics

1 answers

Joya Chatterjee 8 years ago

1023

0Thank You

ANSWER

However can we draw Van-diagram

Posted by Aditya Dhuper 8 years ago

CBSE > Class 11 > Mathematics

1 answers

Manpreet Singh 8 years ago

With hand

0Thank You

ANSWER

If A and B the pts. (3, 4, 5)&(-1, 3-7) respctively find eq.of set of pts.P such that PA^2+PB^2=K^2, where k is acont.

Posted by Sanju Kumar 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Slope of a line √3x-3y= 3 is

Posted by Saurabh Pathak 8 years ago

CBSE > Class 11 > Mathematics

2 answers

Mayank Lakhina 8 years ago

-1/root 3

0Thank You

Talha Sarfraz 8 years ago

1/√3

2Thank You

ANSWER

Lim x secx X?0

Posted by Rohit Bhagat 8 years ago

CBSE > Class 11 > Mathematics

2 answers

Lalita Kumari 8 years ago

1Thank You

Rohan Gupta 8 years ago

1Thank You

ANSWER

What is the no.of ways of choosing 4 cards from a pack of 52 playing crads in how many of these 1.4 cards of the same suit 1.are face cards 3.2arered and 2 ae black cards

Posted by Lokitha Kamachi 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Find the sum of the following series upto n terms 1+3+7+13+21...................

Posted by Lion Naruka 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

find the point on the y axis whose distance from the line x/3+y/4=1 is 4 unit.

Posted by Kashin Gupta 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Find the sum of first n terms of the series 1.3+3.5+5.7+.....

Posted by M K 8 years ago

CBSE > Class 11 > Mathematics

1 answers

M K 8 years ago

Let Sn

0Thank You

ANSWER

Find the domain and range of f f(x) =under root (25-x)

Posted by Gaurav Tandon 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

In a town of 10000 families it was found that 40% families buy newspaper A, 20% families by newspaper B and 10% families by newspaper C, 5 % families by A and B, 3% by B and C and 4% by A and C if 2% family buy all the three newspaper find the number of families with by at least one newspaper only newspaper none of ABC

Posted by Dipsmita Chattopadhyay 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

If tan(a+ø)=n tan(a-ø) show that (n+1) sin2ø=(n-1)sin2a

Posted by Aman Rathod 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

3 friends buy a bulb by contributing 20 rs each . they go to shop of bulb and there was the son of the shopkeeper . so he sell the bulb in to 60 rs . later his father asked him that what u have sell today he said one bulb of 60 rs . the shopkeeper tell his son that this bulb is of 50 rs. so he ordered his son to return 10 rs to the three frnds . NOW HE GAVE 2 RS TO EACH MEANS TOTAL 6 RS AND TAKE 4 RS FOR EATING JALEBI ....NOW THE QUESTION IS THERE IS SOMETHING ERROR IN THE TOTAL CALCULATION BCOZ 60-6 =54 AND THE SON TAKE 4 RS SO 54+4=58 "SO WHERE IS THE OTHER 2 RS???.

Posted by Subho Ghosh 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

What is slope intercept form

Posted by Jai Sengar 8 years ago

CBSE > Class 11 > Mathematics

1 answers

Rohan Gupta 8 years ago

y=mx+c

2Thank You

ANSWER

Evaluate the limit : Lt sin(a+x)+sin(a-x)-2sina. Divide by xwind x-0

Posted by Ravi Rao 8 years ago

CBSE > Class 11 > Mathematics

1 answers

Rohan Gupta 8 years ago

2Thank You

ANSWER

what acute angle does a line of slope - 2 by 3 make with a vertical line

Posted by Kashin Gupta 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

Please answer this question Find the equation of the circle of radius 5 passing through origin and having its centre on X-axis.

Posted by Me Souhardee❤️ 8 years ago

CBSE > Class 11 > Mathematics

3 answers

Joya Chatterjee 8 years ago

It's -10x

1Thank You

Joya Chatterjee 8 years ago

X ^ 2 +y ^ 2 + 10 x+ 20= 0

2Thank You

Rohan Gupta 8 years ago

x^2+y^2-10x=0

2Thank You

ANSWER

Find that the product of distance from the points (+-√a2-b2,0)to the line x/a cos∆+y/B sin∆=1

Posted by Karan Biswal 8 years ago

CBSE > Class 11 > Mathematics

0 answers

ANSWER

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