Express the following as a function of a single angle. Cos^2(81°) – sin^2(81°)

Question

Express the following as a function of a single angle.
Cos^2(81°) – sin^2(81°)

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Margaret 1 week 2021-11-19T08:53:12+00:00 1 Answer 0 views 0

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    2021-11-19T08:54:49+00:00

    Answer:

    = Cos(162°)

    Step-by-step explanation:

    Cos^{2}(81°) – Sin^{2}(81°)

    we know that;

    Cos^{2}(x°) – Sin^{2}(x°) = Cos(2x°)

    Cos^{2}(81°) – Sin^{2}(81°) = Cos(2 * 81°)

    = Cos(162°)

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