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Q.

If x takes negative permissible value, then sin1x=

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a

πcos11x2

b

cos1x21

c

cos11x2

d

cos11x2

answer is B.

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Detailed Solution

Let sin1x=y. Then, x=siny

Now,

    1x0π2sin1x0π2y0.

We have,

      cosy=1sin2y

 cosy=1x2  for 0yπ.                          …(i)

Now,

       π2y0

 π2y0

 cos(y)=1x2                [From (i)]

 y=cos11x2y=cos11x2

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