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    kayceedavis's Avatar
    kayceedavis Posts: 1, Reputation: 1
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    #1

    Jan 7, 2009, 11:39 AM
    verifying trigonometric identities--precalculus
    cosēβ-sinēβ=2cosēβ-1
    EuRa's Avatar
    EuRa Posts: 315, Reputation: 64
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    #2

    Jan 7, 2009, 06:57 PM

    You can break it down a multitude of ways. You could substitite 1 with cosē + sinē (when you do, put parenthesis around it). Or you could subtrace cosē from the left, then right side.

    Either way would be a good way to start. There are more. What you have up there is almost an identity itself.
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