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15 April, 01:36

Use the fundamental identities to simplify the expression.

3tan (-x) cosx

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  1. 15 April, 04:48
    0
    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)
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