Question

cos^2*2a-cos^2*4a=sin6a*sin2a

Answer 1

\(\large cos^2(2a)-cos^2(4a)=sin(6a)sin(2a)\quad ?\)

Answer 2

yea

Answer 3

this is the difference of 2 square quadratic on the left hand side

(cos(2a) + cos(4a))(cos(2a) - cos(4a))

so now simplify the binomials... using double angles...

Answer 4

i have tried that no success..

Answer 5

you don't happen to have a screenshot of it?

Answer 6

its like u wrote it