CBSE Class 12 Math 2012 Solved Paper

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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