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Question

Find the principal solution of 1+2sin x2=1


A

x=π6

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B

x=π3

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C

x=π2

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D

x=π

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Solution

The correct option is A

x=π6


1+2sin x2=1
Squaring, we get
1+2sin x2=11+2sin x=22sin x=1sin x=12x=π6


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