(1) Given 0 < x < π / 2, cosx = 4 / 5, then TaNx = (2) function y = cos (3 π / 2 - x) / cos (3 π - x) minimum positive period is
(1) If cosx = 4 / 5, SiNx = 3 / 5, then TaNx = 3 / 5 / 4 / 5 = 3 / 4 (2) cos (3 π / 2 - x) = cos (x + π / 2) = - SiNx cos (3 π - x) = - cosx y = cos (3 π / 2 - x) / cos (3 π - x) = TaNx, so the minimum positive period is π
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