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CBSE Class 12 Math 2020 Outside Delhi Set 1 Solved Paper

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Section - A

Question numbers 1 to 10 are multiple choice questions of 1 mark each. Select the correct option :
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Question : 1
Total: 36
The value of sin‌−1(cos‌
3π
5
) is
Solution:     👈: Video Solution
sin‌−1(cos‌
33π
5
)=sin‌−1(cos(6π+‌
3π
5
))
=sin‌−1(cos(‌
3π
5
))
sin‌−1(cos(‌
π
2
+‌
π
10
))
=sin‌−1(−sin‌(‌
π
10
))
∴sin‌−1(cos‌
33π
5
)=‌
−π
10
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