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Math Help - [SOLVED] Trignometry Help

  1. #1
    Member looi76's Avatar
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    [SOLVED] Trignometry Help

    Question:
    In each of the following cases find the least positive value of \alpha for which:
     \cos ( \alpha-\theta )^o = \sin \theta^o

    Attempt:
    Don't know how to get the value of \alpha
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  2. #2
    Moo
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    Hello,

    Once again use the formula :

    cos(a-b)=cos(a)cos(b)+sin(a)sin(b)

    So you will have to find \alpha such as \cos(\alpha)=0 and \sin(\alpha)=1 as this relation has to be true for any \theta
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