Question

Use the sum formula to find the exact value of sin(aplha+beta) under the given conditions.

Answer 1

\[\sin \alpha=4/5, 0<\alpha<\pi/2, \cos \beta=(6\sqrt{85})/85, -\pi/2<\beta<0\]

Answer 2

\[\sin (\alpha+\beta)=(3\sqrt{85})/425\]

Answer 3

correct?

Answer 4

ya corret