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Given both thetaa n dphi are acute angl...

Given both `thetaa n dphi` are acute angles and `sintheta=1/2,cosvarphi=1/3,` then the value of `theta+varphi` belongs to (a)`(pi/3,pi/2]` (b) `(pi/2,(2pi)/3]` (c) `((2pi)/3,(5pi)/6]` (d) `((5pi)/6,pi]`

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