# If θ and ϕ be acute angles and sinθ = 1/2 and cosϕ = 1/3 then: a.π/6 < θ + ϕ < π/3 b.π/3 < θ + ϕ < π/2 c.π/2 < θ + ϕ < 2π/3 d.2π/3 < θ + ϕ < 5π/6

*print*Print*list*Cite

### 1 Answer

`sin(theta)=1/2`

`theta=pi/6`

`cos(phi)=1/3`

`pi/4<phi<pi/3`

`pi/6<theta+phi<(pi/3+pi/6)`

`Ans.`

`b`