int0^1(tan^(-1)x)/x dx is equals to (a) ...

`int_0^1(tan^(-1)x)/x dx` is equals to (a) `int_0^(pi/2)(sinx)/x dx` (b) `int_0^(pi/2)x/(sinx)dx` (c)`1/2int_0^(pi/2)(sinx)/x dx` (d) `1/2int_0^(pi/2)(""x)/(sinx)dx`

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