If P(x,y) is the point on the unit circle corresponding to 0, then use the definition of the cosine and secant function to prove the reciprocal identity sec 0= cos 0 O A. Since cos 0= y and sec 0 = sec 0 = y' cos 0 1 O B. Since cos 0= and sec 0 = y y sec 0 = x' cos 0 1 and sec 0=x, sec 0 = O C. Since cos 0= 1 cos 0 O D. Since cos 0=x and sec 0 = 1 sec 0 = cos 0

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