CBSE > Class 12 > Mathematics | CBSE Board | Homework Help

A function is said to be onto , if there exist an x for every y . hence to prove a function to be onto just solve the function for an x . And Mere tarike se yaad rakhane k liye → Range of given function. = co-domain of given function. ??I hope ye apko helpful hoga .????▪▫▫▫▫▫▪▪▪▪▪▪

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If A=[5 7 9][9 8 7][19 14 9],then find|A|

Posted by Aman Badhwar 5 years ago

CBSE > Class 12 > Mathematics

1 answers

Shraddha ✨✰✰ 5 years ago

Ans. → 0 =5 (72 - 98) - 7(81 - 133) + 9(126 - 152) = -130 +364 - 234 = 0 .

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The area of a triangle with vertices(-3,0),(3,0)and(0,k) is 9 sq.units. find the value of k.

Posted by Aman Badhwar 5 years ago

CBSE > Class 12 > Mathematics

2 answers

Shraddha ✨✰✰ 5 years ago

Ans. → = 1/2( x1 ( y2 - y3 ) + x2 ( y3 - y1 ) + x3 ( y1 - y2) = 1/2 [ -3 ( 0 - k ) + 3 ( k - 0 ) + 0 ( 0 - 0 ) = 1/2 [-3(k) + 3k + 0 ] = 1/2 ( 3k + 3k ) .°. 3k = 9 (°.° ar.∆ABC = 9 unit² ) .°. k = 3 ans.

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Krati Varshney 5 years ago

Use the formula of area of triangle :- 1/2 (x1(y2-y3)+x2 (y3-y1)+x3 (y1-y2))=0 Put all the given values in this then u will get ur answer urself..??

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Show that the height of the right circular cylinder of greatest volume which can be inscribed in a right circular cone of height h and radius r is one-third of the height of the cone, and the greatest volume of the cylinder is 4/9 times the volume of the cone.

Posted by Atul Kumar 5 years ago

CBSE > Class 12 > Mathematics

0 answers

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Integral (1/1+tanx)

Posted by Kl? ?? 5 years ago

CBSE > Class 12 > Mathematics

1 answers

Tanisha Yadav 5 years ago

x/2-1/2log|cosx-sinx|+c

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Integral 1/sinxcosx

Posted by Kl? ?? 5 years ago

CBSE > Class 12 > Mathematics

1 answers

Stuti Trivedi 5 years ago

Log lcosec2x-cot2xl +c

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Hi frd. As board is near I am forgetting to study plz help me???

Posted by Arsh Sandhi 5 years ago

CBSE > Class 12 > Mathematics

1 answers

Akanksha Kumari 5 years ago

Then start study

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Find the shortest distance between the lines x/2 =y/-3=z and (x-2)/3=(y-1)/-5 =(z+2)/2

Posted by Laxmi Saharan 5 years ago

CBSE > Class 12 > Mathematics

0 answers

ANSWER

Find the equation of plane passing through the point (1,1,-1) and perpendicular to each of the planes x+2y+3z-7=0 and 2x-3y+4z=0.

Posted by Mohit Kachroo 5 years ago

CBSE > Class 12 > Mathematics

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Find the equation of plane passing through the point (-1,3,2) and perpendicular to each of the planes x+2y+3z=5 and 3x 3y +z=5.

Posted by Mohit Kachroo 5 years ago

CBSE > Class 12 > Mathematics

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Integrate 1 /16-9x² dx

Posted by Mahabeer Singh Aswal 5 years ago

CBSE > Class 12 > Mathematics

1 answers

Mr. Badmash 5 years ago

Write 1/16-9x^2 as 1/(4)^2-(3x)^2 and apply formula from NCERT

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differentiation of log^2x+logx

Posted by Iqbal Singh 5 years ago

CBSE > Class 12 > Mathematics

3 answers

Arjit Arjit 5 years ago

2logx+logx 3logx Now dy/dx=d/dx (3logx) =3/x

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Iqbal Singh 5 years ago

ok thanks mera answer aa geya bro agin thanks????

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Mr. Badmash 5 years ago

Firstly write log^2x+logx.,,,,, As (logx)^2+logx and apply log property of power then solve it by itself....??? Agar fir bhi nhi bane to bta dena

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TO find dy/dx if y=2√cosec(x^3+1)

Posted by Yashika Longkumer 5 years ago

CBSE > Class 12 > Mathematics

1 answers

Sonal . 5 years ago

dy/dx=-2cosec(x^3+1) cot (x^3+1)×3x^2/2√cosec(x^3+1) dy/dx =-3x^2 cosec(x^3+1) cot(x^3+1)/√cosec(x^3+1)

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Let multiply be binary operation on a set of real number defined by a into b=a + b a,b £R then value of 6*(3*3) is?

Posted by Real Me 5 years ago

CBSE > Class 12 > Mathematics

0 answers

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If A is any square matrix of order 3 × 3 such that |A| = 3, then the value of |adjA| is? 3 13 9 27

Posted by Shubham Mamgain 5 years ago

CBSE > Class 12 > Mathematics

2 answers

Siya Soni 5 years ago

|adj A|=|A|^n-1 n is the order of determinent |A|^3-1=|A|^2......(1) |A|=3 put this value in eq (1) 3^2=9 Hence 9 is the required answer

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Tanisha Yadav 5 years ago

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How prepare for board exam

Posted by Vaibhav Singh 5 years ago

CBSE > Class 12 > Mathematics

0 answers

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How to prepare maths syllabus for board exams... especially integration..is ncert enough for boards or we have he to need any other book??

Posted by Arpita Sharma 5 years ago

CBSE > Class 12 > Mathematics

0 answers

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If y=e^xcos +(cosx)^x then find dy/dx

Posted by Laxmi Saharan 5 years ago

CBSE > Class 12 > Mathematics

2 answers

Siya Soni 5 years ago

e^cosx[cosx-sinx] +xcosx^x-1(-sinx)

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Riya Sen 5 years ago

e^xcosx(cosx-xsinx)+cosx^x[log(cosx)-xtanx]

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Increasing decreasing function concept

Posted by Prathamesh Ghadage 5 years ago

CBSE > Class 12 > Mathematics

2 answers

Prathamesh Ghadage 4 years, 11 months ago

Thanks

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Tanisha Yadav 5 years ago

If f′(x) > 0 at each point in an interval I, then the function is said to be increasing on I. f′(x) < 0 at each point in an interval I, then the function is said to be decreasing on I. ... If f′(x) > 0, then f is increasing on the interval, and if f′(x) < 0, then f is decreasing on the interval.

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Can anyone suggest how to study for long period of time without losing concentration ???

Posted by Ashish Mishra 5 years ago

CBSE > Class 12 > Mathematics