Question

Picture, it's with trigonometric identities

Answer 1

Well you can prove that they equal each other

Answer 2

if that's what you're asking..

Answer 3

is an identity where they equal each other?

Answer 4

The definition of identity is "an equality that holds regardless of the values of its variables". If you can prove that this equation follows this definition, then you can say that it is an identity. For these kind of questions, we split the two parts up:

LHS (Left Hand Side):
A + B + C + D...
... (simplify)
= R (I'm making this up)

RHS (Right Hand Side):
A + E - T + H
... (simplify)
= R
= LHS

Since LHS = RHS, this equation is an identity.

Answer 5

thanks!