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) ?

Enter your answer, as a fraction in simplified form,

I found a similar thread.

https://web2.0calc.com/questions/cos-3-4-where-3-2-tan-3-4-where-0-2-what-is-the-exact_2