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JEE MATHEMATICS MCQ: INVERSE TRIGONOMETRY

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If sin⁡−1(x)α=cos⁡−1xb=tan⁡−1yc,0<x<1,\frac{{{{\sin }^{ - 1}}\left( x \right)}}{\alpha } = \frac{{{{\cos }^{ - 1}}x}}{b} = \frac{{{{\tan }^{ - 1}}y}}{c},0 < x < 1, then the value of cos⁡(πca+b)\cos \left( {\frac{{\pi c}}{{a + b}}} \right) is
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Correct option: C
1−y21+y2 \frac{{1 - {y^2}}}{{1 + {y^2}}}\,
Option C (1−y21+y2,\frac{{1 - {y^2}}}{{1 + {y^2}}}\\,) is correct because it is derived from trigonometric identities and the given relationships between inverse trigonometric functions.

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