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

If `y="sec"(tan^(-1)x),t h e n(dy)/(dx)a tx=1` is

(a)`cos(pi/4)`

(b) `sin(pi/2)`

(c)`sin(pi/6)`

(d) `cos(pi/3)`

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