What is sin(-90 degrees)?

Consider that -90° corresponds to 270° (the minus sign is to turn clockwise instead of counter-clockwise): so: sin(-90°)=sin(270°)=-1

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In a right angle, one angle measures d°, where cosd°=5/13. What is

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How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora