Question

11. Given that sin theta = a÷b . then cos theta = ..
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Answer 1

sin theta= opposite side/ hypotenuse

cos theta = adjacent side/ hypotenuse

a = opp. side, b= hypotenuse

so, adj. side= $\sqrt({b^{2} }-a^{2})$

hence, cos theta= $\frac{\sqrt({b^{2} }-a^{2})}{b}$