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Evaluate cot(π4+h)1h\frac { \cot \left( \frac { \pi } { 4 } + h \right) - 1 } { h }

question 120

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Evaluate
cot(π4+h)1h\frac { \cot \left( \frac { \pi } { 4 } + h \right) - 1 } { h }


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