Find the incorrect statement :...

Find the incorrect statement :

A

`pi/9 radians =20^o`

B

In a circle ,length of arc l =`rtheta` where r is the radius of the circle and `theta` is radian measure .

C

`sin[(3pi)/2 +theta]=costheta`

D

`tan120^o =-sqrt3`

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The correct Answer is:

C

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