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If f(x)=xtanx, find f(π4)f ( x ) = \frac { x } { \tan x } , \text { find } f ^ { \prime } \left( \frac { \pi } { 4 } \right)

question 117

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If f(x) =xtanx, find f(π4) f ( x ) = \frac { x } { \tan x } , \text { find } f ^ { \prime } \left( \frac { \pi } { 4 } \right) .


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