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Homederivatives of trig. functions

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# derivatives of trig. functions

## Question

The derivation (proceeding from the limit of sinx/x) of those derivatives is lacking.

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## Comments

## proving derivatives of trig functions

## Re: proving derivatives of trig functions

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## matte's project (was proving derivatives of trig functions)

## Re: matte's project

## Re: matte's project