Answer and Explanation
Your Answer is
Correct Answer is J
Explanation
It can be known from the title: sina=4/5, cosa=3/5, sinb=8/17, cosb=15/17, so sin(a+b)=sinacosb+sinbcosa=4/5*15/ 17+8/17*3/5=
40. The 2 triangles in the figure below share a common side. What is sin (a + b) ?
(Note: sin(a + b) = sin a cos b + sin b cos a for all a and b.)
