cosθ= −√3/4, where π≤ θ≤ 3π/2. tanβ= 3/4, where 0≤β≤ π/2. What is the exact value of sin(θ+β)?

cosθ= −√3/4, where π≤ θ≤ 3π/2. tanβ= 3/4, where 0≤β≤ π/2. What is the exact value of sin(θ+β)?