Consider that -90° corresponds to 270° (the minus sign is to turn clockwise instead of counter-clockwise): so: sin(-90°)=sin(270°)=-1
trigonometry - Why does sin(90)=1, and not 0? - Mathematics Stack Exchange
In triangle ABC angle C = 90 degrees Prove That, [(1 - sin A)/(1 + co - askIITians
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