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If f(x)=cos^(-1)(1/sqrt(13)(2cosx-3sinx)...

If `f(x)=cos^(-1)(1/sqrt(13)(2cosx-3sinx))` `+sin^(-1)(1/sqrt(13)(2cosx+3sinx)) ,` then find `(df(x))/(dx)` at `x=3/4dot`

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