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`

Answer 1

sec x= `2/sqrt3`

`cos x = sqrt3/2 = cos pi/6 = cos(2pi - pi6)`

`pi/6, (11pi)/6`