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Math Help - find the exact value

  1. #1
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    find the exact value

    cos(sin^-1 3/5) im not certain how to start solving this problem. any help would be appreciated. thanks
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  2. #2
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    Re: find the exact value

    Try a reference triangle. If you don't know what I mean, write back, I'll explain it more.

    The basic idea is to draw a triangle with an angle of which the sine is 3/5. Then figure out what the cosine of that angle must be.
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  3. #3
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    Re: find the exact value

    thanks so much
    so the ref triangle would tell me that the cos is 4/5? Its silly that was so easy. thanks again
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  4. #4
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    Re: find the exact value

    Yes. Keep that reference triangle in mind, it's often useful, in integration for example.
    Thanks from engineeroneday
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