Suppose 0 < theta < pi/2 and tan theta= 7/8 .Evaluate cos theta and sin theta.
tan theta = 7/8
tan theta ^2 =49/64
sec theta ^2 =1+49/64 =113/64
cos theta^2 =64/113
sin theta ^2 =49/113
sin theta =7/square root (113)=0.6585
cos theta = 8/square root (113)=0.7526
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