Question

Verify the identity Help!!!

Answer 1

\[\cos 5t \cos 3t =1/2 + \sin (-5t) \sin 3t\]

\[\cos 5t \cos 3t - \sin (-5t) \sin 3t = 1/2\]

\[\cos 5t \cos 3t + \sin 5t \sin 3t = 1/2\]

\[\cos (5t-3t)= 1/2\]

\[\cos 2t= 1/2\]

Answer 2

Thats what i have so far

Answer 3

\[[0,\pi)\]

Answer 4

pi/6 and 5pi/6

Answer 5

what would be my next step though?

Answer 6

2t=arc cos(1/2)
2t=pi/3 and 5pi/3
Now proceed..

Answer 7

U verifying an identity or solving..?

Answer 8

let t=0 to see it is not an identity

Answer 9

That's because we can only see what he has so far...

Answer 10

We don't know what he did before:-)

Answer 11

Verify the identity

is very specific

Answer 12

I'm just going with the first equation written