Need help on geomtry homework

Provide an example of a trigonometric function and describe how it is transformed from the standard trigonometric function f(x) = sin x, f(x) = cos x, or f(x) tan x using key features.

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?