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ds^2 = dx^ + dy^2 + dz^2

is the same as

ds^2 = dr^2 + r^2 (dpheta^2 + sin^2pheta*dphi^2)

.... I know that I need to use x = r sin pheta cos phi

y = r sin pheta sin phi

z = r cos pheta

I am confused but I think I have to take the derivitive of something. Do I somehow take the partial derivitives and if so of what? Can someone point me in the right direction. Thank you!

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# Distance equations for different cord. systems

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