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I'm working (playing) on a problem involving approximating the arcsin() function.

I've attmpted to verify the known derivative of the arcsin function

(d(arcsin))/dx = 1/sqrt(1-z^2)

I know I have a mistake in my derivation. I've attached an electronic copy of my work.

Can you help resolve my error?

Thanks

-Sparky

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# Complex Variables Derivation of arcsine derivative

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