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Math Help - Trig expression

  1. #1
    VkL
    VkL is offline
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    Trig expression

    Let x be in the 2nd quadrant such that sin(x) = a.

    Evaluate the expression in terms of a

    Cos^2(arcsin(a))

    Any help?
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  2. #2
    Senior Member I-Think's Avatar
    Joined
    Apr 2009
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    cos^2\theta=1-sin^2\theta

    Sooooooooo...

    cos^2(arcsin(a))=1-sin^2(arcsin(a))

    Should be solvable from there

    Last hint: sin(arcsin\theta)=\theta
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