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Questions  

Solution of the equation tancos1x=sincot112 is

a
x=±73
b
x=±53
c
x=±352
d
none of these

detailed solution

Correct option is B

We have, tan⁡cos−1⁡x=sin⁡cot−1⁡12⇒tan⁡tan−1⁡1−x2x=sin⁡tan−1⁡2⇒tan⁡tan−1⁡1−x2x=sin⁡sin−1⁡21+4⇒tan⁡tan−1⁡1−x2x=sin⁡sin−1⁡25⇒1−x2x=25⇒51−x2=4x2⇒9x2=5,∴x=±53.

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