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Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values
of the trigonometric functions at t, whenever possible.
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a) t = ---> P = (-1,0); cos(t) = -1, sin(t) = 0.
b) t = ---> P = (1,0); cos(t) = 1, sin(t) = 0.