## anonymous 5 years ago how do I rewrite the expression sin(pie/2 + x) in terms of sin x and cos x? thanks

Well at x = 0 the expression will have the value $$sin(\pi/2) = 1$$. The value of the expression will always ahead of the typical sin function. At $$x = \pi$$ the value of the expression will be -1. We can see that these values directly correspond to the values of the cosine function at 0, and pi respectively. $$sin(\pi/2 + x) = cos(x)$$