Q.
If sinsin−115+cos−1x=1, then x is equal to
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a
1
b
0
c
4/5
d
1/5
answer is D.
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Detailed Solution
We have, sinsin−11/5+cos−1x=1⇒ sin−115+cos−1x=π2⇒ sin−115=π2−cos−1x⇒sin−115=sin−1x⇒x=15
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