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Math Help - Exact Values using sum and differnce identites

  1. #1
    Newbie Zora's Avatar
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    Exact Values using sum and differnce identites

    Need help with both.
    Find the exact value using the sum and difference identities.

    a.sec105(degrees)
    b.cospi/12
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  2. #2
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    Quote Originally Posted by Zora View Post
    Need help with both.
    Find the exact value using the sum and difference identities.

    a.sec105(degrees)
    b.cospi/12
    a) Find cos(60 + 45) or cos( 135 - 30)

    b) Find cos(π/3 - π/4)
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