If the tangent to the curve = x = a(thet...

If the tangent to the curve = `x = a(theta +sin theta), y = a(1+cos theta ) "at" theta = pi/3` makes an angle `alpha ` with x - axis then `alpha =`

A

`pi/3`

B

`(2pi)/3`

C

`pi/6`

D

`(5pi)/6`

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The correct Answer is:

D

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