Suppose -pi/2 < theta < 0 and cos theta= 1/7 .Evaluate sin theta and tan theta.
cos theta =1/7
cos theta ^2 =1/49
sin theta ^2 =1-1/49 =48/49
sin theta = square root of 48/7 = 0.9897
cos theta = 0.142857
tan theta = square root of 48= 6.928
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