Question 1015371
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Let P be the point on the unit circle U that corresponds to {{{highlight(angle)}}} t. Find the coordinates of P and the exact values 
of the trigonometric functions at t, whenever possible.
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a) t = {{{-pi}}}   --->  P = (-1,0);  cos(t) = -1,  sin(t) = 0.


b) t = {{{6*pi}}}  --->  P = (1,0);   cos(t) = 1,   sin(t) = 0.
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