Question

If 5
1
4
sin
3
sin = = A B and A, B are angles in the second quadrant then prove that 4cosA + 3cosB = −5.

Answer 1

Answer:

Bro, your question is not clear. Plz write it again clearly so that I may help you!

Answer 2

Answer:

1

4

sin

3

sin = = A B and A, B are angles in the second quadrant then prove that 4cosA + 3cosB = −5.