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OpenStudy (anonymous):
Find exact values of sin (u/2), cos (u/2), and tan (u/2) using half-angle formulas. ? cos u = 3/5, 0 < u < pi/2 i started to do it but im confused please help!
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OpenStudy (shubhamsrg):
cos 2u = 1- 2sin^2 u = 2cos^2 u -1 will this help ?
OpenStudy (shubhamsrg):
hint : replace u by u/2
OpenStudy (anonymous):
yes thanks!!
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