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If theta and phi are acute angles, sin t...

If `theta` and `phi` are acute angles, `sin theta=1/2, cos phi= 1/3`, then the value of `(theta + phi)` is:

A

`(pi/3, pi/2]`

B

`(pi/2, (2pi)/3)`

C

`((2pi)/3, (5pi)/6]`

D

`((5pi)/6, pi]`.

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