Trigonometric Functions of Real Numbers?
if sin(-s)=3/5 (pi
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sin(s) = -sin(-s) for any angle.
Therefore sin(s) = -3/5.
s is a third quadrant angle, and in the 3rd quadrant, cos is negative.
Therefore cos(s) = -4/5.
cos(s) = cos(-s) for any angle.
Therefore cos(-s) = -4/5.
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