# Math Help - equivalent cosine function

1. ## equivalent cosine function

Determine an equivalent cosine function for each sine function.
y=2sin4(x+pi) y=-sin2(x+pi/6)

Thanks!

2. Originally Posted by johett
Determine an equivalent cosine function for each sine function.
y=2sin4(x+pi) y=-sin2(x+pi/6)

Thanks!
Cosine is just the sine function, but shifted over by $\frac{\pi}{2}$