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Q.

If sin-1x-cos-1x=sin-13x-2 and x>0 then x=

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a

12,1

b

1,-12

c

0,12

d

-1,12

answer is D.

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Detailed Solution

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sin-1x-cos-1x=sin-13x-2 π2-2 cos-1x=sin-1(3x-2) π2-sin-1(3x-2)=2 cos-1x cos-1(3x-2)=cos-12x2-1 3x-2=2x2-12x2-3x+1=0 (2x-1)(x-1)=0
x=1,12

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