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Evaluate: `lim_(xrarr(pi)/(4)) (sin x -cos x)/(x-(pi)/(4))`

Answer» `underset(xrarr(pi)/(4))"lim"(sin x-cos x)/(x-(pi)/(4)) (0)/(0)`
`underset(x-(pi)/(4)rarr0)"lim"(sqrt(2)[sinx.cos(pi)/(4)-cos x.sin(pi)/(4)])/((x-(pi)/(4)))`
`=underset(x-(pi)/(4)rarr0)"lim"(sqrt(2).sin(x-(pi)/(4)))/(x-(pi)/(4))`
`=sqrt(2)xx1=sqrt(2)`.


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