If f ( x ) = \operatorname { cosec } x + \operatorname { cot } x , \te – InterviewSolution

1.	If f ( x ) = \operatorname { cosec } x + \operatorname { cot } x , \text { find } f ^ { \prime } ( \frac { \pi } { 4 } )
Answer» Dy/dx= -cotx. cosecx+(-cosec^2x) now puttingx=π/4(-1) (√2)+(2)2-√2

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