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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)wdotrdottsqrt(1+x^2),` then find `(df(x))/(dx)` at `x=3/4dot`

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