trig

Find the exact value of the trigonometic function at the given real number of cot(5pi/3)

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  1. 5π/3 is in quadrant IV
    in IV the cotanglent like the tangent is negative.
    the "related" angle is π/3 ......(5π/3 radians = 300°, π/3 radians = 60° )

    so cot 5π/3
    = -cot π/3

    we know tan π/3 = √3/1 , so

    -cot π/3 = -1/√3

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    posted by Reiny

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