Question

Which function's graph has a period of 2?
a. y=2sin3x
b. y=3cos(pi)(x)
c. y=-4sin2x
d. y= cos(x-pi/2)

Answer 1

look up simple harmonic motion

Answer 2

... i'm good.

Answer 3

\(\bf y=Asin({\color{blue}{ B}}x+C)\qquad period\implies \cfrac{2\pi}{{\color{blue}{ B}}}\)