cosine(x) = -1
x = (270 + 360N) degrees
or
x = (1.5 + 2N) pi radians
N is any integer, positive or negative.
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No, it does not.
∫ -cos(x) dx = -sin(x) + C
Negative cosine f(x) = sin(x) f'(x) = -cos(x)
You could just pull out the half: it will be (1/2) cos squared x.
x-1 means 1/x, also called the reciprocal of x.