Question

simplify an expression using a double-angle formula

Answer 1

\[\cos^25\theta - \sin^25\theta \]

Answer 2

\(\cos(2\theta) = \cos^2(\theta)-sin^2(\theta)\)

for you \(\theta=50\)

Answer 3

okay... but I'm not trying to find theta? that's confusing..

Answer 4

so what do i do? @zzr0ck3r

Answer 5

the answer is \(\cos(2*50)=\cos(100)\)

Answer 6

do you see?

Answer 7

we are just simplifying it.

Answer 8

ohhh okay!