Verify the Identity tan(-x)cos(x)=-sin(x)

Math
Start on the left side.
Since is an odd function, rewrite as .
Write in sines and cosines using the quotient identity.
Cancel the common factor of .
Because the two sides have been shown to be equivalent, the equation is an identity.
is an identity
Verify the Identity tan(-x)cos(x)=-sin(x)

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