Question

The function f(x)=-3cos(2x+(π/4)) has

A. amplitude 3 and period π
B. amplitude 2 and period (2π/3)
C. amplitude 3 and period 4π
D. amplitude 3 and period 2π

Answer 1

for the function of type y = a* cos (bx +c)
a is the amplitude, 2(pi)/b is the period

Answer 2

So A?

Answer 3

Yes

Answer 4

Thanks!