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CBSE Class 12 Math 2012 Solved Paper

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Question : 7 of 29
Marks: +1, -0
Write the principal value of cos−1(
1
2
) - 2 sin−1(
1
2
)
Solution:  
Principal value of cos−1(
1
2
) =
π
3
Principal value of sin−1(
1
2
) = −
π
6
Hence principal value of cos−1(
1
2
) - 2 sin−1(
1
2
)
=
π
3
−2(−
π
6
)
=
2π
3
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