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Math Help - Prove this...

  1. #1
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    Prove this...

    If x = r cos sin, y = r cos cos and z = r sin , show that x +y +z = r.
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  2. #2
    Moo
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    Hello,

    This is pretty simple !

    x^2+y^2+z^2=r^2[\cos^2\alpha\sin^2\beta+\cos^2\alpha\cos^2\beta+\s  in^2\alpha]=r^2[\cos^2\alpha(\sin^2\beta+\cos^2\beta)+\sin^2\alpha] =r^2[\cos^2\alpha+\sin^2\alpha]=r^2
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