If sinθ= 4/5 in quadrant II, what is cosθ?
Q II has negative values of cosine
sin^2 + cos^2 = 1
(4/5 )^2 + cos^2 = 1
cos^2 = 9/25 cos = +- 3/5 but we need negative in Q II so - 3/5
+36915 
