Question

Evaluate (if possible) the following function at the given values of the independent variable. f(x) = cos2x
a) f(0)
b) f(-π/4)
c) f(π/3)

Answer 1

I forgot all about double angles

Answer 2

cos(2*0) =
cos(-2pi/4) =
cos(2pi/3) =

No need. When it saus f(0), this means replace x with 0. f(-pi/4) replace x with -pi/4. etc

Answer 3

So in this case I can just replace them? Yay ok thanks!

Answer 4

Yep. No formulas xD