Falling Behind in Studies? Join Our Performance Improvement Batch. Enroll For Free
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
Cos x cos 2x cos 4x.......cos(2^(n-1) x)=Sin2^n x÷2^n sin x
Use identity cosx = Sin(2x)/2sinxSo.... Cos(2x) = Sin(4x) / 2Sin(2x).... ...------. 1.....Notice ...power of 2 in LHS is 1 and in RHS is (1 +1) in equation 1 So.... Where power of 2 in LHS is n-1, in RHS it must be n.... {Sin2x/2Sinx} {Sin4x/2Sin2x} .. .. . . {Sin(2^n)x/2Sin(2^n-1)} = Sin(2^nx)/2^n Sinx
Post Question
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -