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If y="sec"(tan^(-1)x),t h e n (dy)/(d...

If `y="sec"(tan^(-1)x),t h e n (dy)/(dx) ` at x=1 is (a)`cos(pi/4)` (b) `sin(pi/2)` (c)`sin(pi/6)` (d) `cos(pi/3)`

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