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Question
The principal solutions of sec x = `2/sqrt3` are _____
Options
`pi/3,(11pi)/6`
`pi/6, (11pi)/6`
`pi/4,(11pi)/4`
`pi/6,(11pi)/4`
Solution
sec x= `2/sqrt3`
`cos x = sqrt3/2 = cos pi/6 = cos(2pi - pi6)`
`pi/6, (11pi)/6`
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