What is sin(-90 degrees)?
By A Mystery Man Writer
Description
Consider that -90° corresponds to 270° (the minus sign is to turn clockwise instead of counter-clockwise): so: sin(-90°)=sin(270°)=-1
What can you say about the values of sin A and cos A, as the value of angle A increases from { 0 }^{ circ } and { 90 }^{ circ }?
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