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Convert sin7a + sin5a as a product . Solve it .. thanks a lot

Convert sin7a + sin5a as a product . Solve it .. thanks a lot 

Grade:12

2 Answers

Vikas TU
14149 Points
3 years ago
Dear student
sin 7α + sin 5α
= 2 sin (7α + 5α)/2 cos (7α - 5α)/2, [Since, sin α + sin β = 2 sin (α + β)/2 cos (α - β)/2]
= 2 sin 6α cos α
Hope this helps 
Good luck 
 
 
Sai Soumya
99 Points
3 years ago
FORMULA:
sin A + sin B
= 2.sin(A+B)/2.sin(A-B)/2
 
Now put the values according to the question you will get it

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