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Questions  

The number of solutions of sin1x+sin1(1x)=cos1x is

a
1
b
0
c
2
d
4

detailed solution

Correct option is C

sin−1⁡x+sin−1⁡(1−x)=cos−1⁡x⇒sin−1⁡(1−x)=cos−1⁡x−sin−1⁡x=π2−2sin−1⁡x⇒1−x=cos⁡2sin−1⁡x=1−2sin⁡sin−1⁡x2=1−2x2⇒2x2−x=0⇒x=0 or 12

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