# How do you rewrite y=-4cos(2x+(pi/2))+1 as a sine function?

##### 1 Answer
May 15, 2015

since on the trig unit circle: $\cos \left(2 x + \frac{\pi}{2}\right) = \sin \left(2 x\right) ,$ then

$y = - 4 \sin \left(2 x\right) + 1$