Recall that 1 + tan2t = sec2t, so sec2t - 1 = tan2t
Therefore, (sec2t-1)/sec2t = tan2t/sec2t
= (sin2t/cos2t)/(1/cos2t)
= (sin2t/cos2t)(cos2t/1) = sin2t
Denis A.
asked • 10/29/15sec2t-1/sec2t=sin2t
sec2t-1/sec2t= sin2t
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