mayalal557 mayalal557

24-04-2021
Mathematics

contestada

(Prove that):
2 sin 7A. cos 2A = sin 9A + sin 5A

Respuesta :

cwrw238 cwrw238

24-04-2021

Answer:

Below.

Step-by-step explanation:

We use the identity:

sin A + sin B = 2 sin(A+B)/ 2 cos(A-B)/2

so sin 9A + cos 5A

= 2 sin (9A + 5A)/2 cos (9A - 5A)/2

= 2 sin 14/2 cos 4/2

= 2 sin7A cos 2A.

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