Question

which function has an amplitude of 2 and a period of p?

a. f(x)=1/2cos2x
b. f(x)=2cospx
c. f(x)=1/2cospx
d. f(x)=2cos2x

Answer 1

Clearly it has to be either a) or d)
period: 2π/k = period
2π/k = p
k = 2π/p
I will assume you want p to be π
so k = 2

looks like d)

Answer 2

uggub