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Math Help - Prove the Following

  1. #1
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    Post Prove the Following

    What is this question asking
    Prove the following( I know it's asking me to proove something)
    sin((pi/4)+x)-sin((pi/4)-x)= root(2sinx)+1.41sinx
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  2. #2
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    Quote Originally Posted by nightrider456 View Post
    What is this question asking
    Prove the following( I know it's asking me to proove something)
    sin((pi/4)+x)-sin((pi/4)-x)= root(2sinx)+1.41sinx
    use the sum/difference identity for sine ...

    \sin(a \pm b) = \sin{a}\cos{b} \pm \cos{a}\sin{b}

    you should get just \sqrt{2}\sin{x} on the right side
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