[SOLVED] derivative of inverse cosine function.

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fareen

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hi
i need help with finding the derivative of the following function
cos^-1([z]\[x^2+y^2+z^2]^0.5)
i need tthe answer in simpler form
i cum up with this answer
[z*x(x^2+Y^2)^0.5]\[(x^2+y^2+z^2)^0.5]
is it right???
derivating with respect to x.
 
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