Find Sine and Cosine Given Tangent Value and Sign of Sign of Sine Value

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This video explains how to determine the sine and cosine function values given the tangent function value and the sign of the sine function value.
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Explained perfectly! Thank you for this video :)

chyxz
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wasn't there another way, like, cross multiplying like
14/18=SIN/COS
14COS=18SIN and then you do the SIN^2+COS^2=1

chocolino