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Thread: [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 $\displaystyle \alpha$ for which:
    $\displaystyle \cos ( \alpha-\theta )^o = \sin \theta^o $

    Attempt:
    Don't know how to get the value of $\displaystyle \alpha$
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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 $\displaystyle \alpha$ such as $\displaystyle \cos(\alpha)=0$ and $\displaystyle \sin(\alpha)=1$ as this relation has to be true for any $\displaystyle \theta$
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