Trigonometry

Find cos⁡(76n).

Find sec⁡(23n)

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  1. cos(76pi)=cos(74pi)=...=cos(2pi)=cos0=1
    sec(23pi)=sec(21pi)=...=sec(3pi)=sec(pi)= -1

    because the period T=2pi
    (If pi=n)

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