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If y=x/(sqrt(a^2-1))-2/(sqrt(a^2-1))tan^...

If `y=x/(sqrt(a^2-1))-2/(sqrt(a^2-1))tan^(-1)((sinx)/(a+sqrt(a^2-1)+cosx))` where `a in (-oo,\ -1)uu(1,\ oo)` then `y '(pi/2)` equals `1/a` (b) `2/a` (c) `1/(2a)` (d) `a`

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