Home
Class 10
MATHS
If cos9alpha=sinalpha and 9alpha<90^@the...

If `cos9alpha=sinalpha and 9alpha<90^@`then the value of `tan 5alpha` is

A

0

B

1

C

`sqrt3`

D

`1/sqrt3`

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • INTRODUCTION TO TRIGONOMETRY

    R G PUBLICATION|Exercise EXERCISE|95 Videos

  • CONSTRUCTIONS

    R G PUBLICATION|Exercise EXERCISE|1 Videos

  • MODEL PAPER 1

    R G PUBLICATION|Exercise EXERCISE|35 Videos

Similar Questions

Explore conceptually related problems

If A=[(cos alpha, -sin alpha),(sin alpha, cos alpha)] and A+A^(T) =l , write down the general values of alpha .

If A=[(0, -tan""(alpha)/(2)),(tan""(alpha)/(2),0)] , then show that (I+A) =(I-A) [(cos alpha, - sin alpha),(sin alpha, cos alpha)] , where I is the identity matrix of order 2.

If A=[(cos alpha,sinalpha),(-sinalpha,cosalpha)] , verify that A'A=I_2

If A=[(cos alpha,sinalpha),(-sinalpha,cosalpha)] , prove by induction that A^n=[(cosnalpha,sinnalpha),(-sinnalpha,cosnalpha)],n in N

If A =[(cos alpha, sin alpha),(-sin alpha, cos alpha)] , then find A^(T) A.

If cos^2alpha-sin^2alpha=tan^2beta ,show that cos^2beta-sin^2beta=tan^2alpha

Prove that the locus of the points of intersection of the lines x cos alpha + y sin alpha = a and x sin alpha - y cos albha = b is a cicle, whatever may be alpha

Solve sin 3alpha=4 sin alpha sin (x+alpha)sin(x-alpha) where alpha=n pi,n in Z .

If cos 9 theta = sin theta and 9 theta < 90° then find the value of tan 5 theta.

If tantheta=(sinalpha-cosalpha)/(sinalpha+cosalpha) then prove that sqrt2(costheta) =cosalpha+sinalpha