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Use the fundamental identities to simplify the expression. 3tan(-x)cosx
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Use the fundamental identities to simplify the expression.
3tan(-x)cosx

User Bibliophilsagar
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1 Answer

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The identities we'll use are

tan(-x) = -tan(x)
tan(x) = sin(x)/cos(x)

which allows us to say...

3*tan(-x)*cos(x)
3*(-tan(x))*cos(x)
-3*tan(x)*cos(x)
-3*(sin(x)/cos(x))*cos(x)
-3sin(x)

The final answer is -3sin(x)
User RocketSpock
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