Math, asked by rampatare40, 1 year ago

6. sin 4A + sin 2A= ...

Answers

Answered by Ïmpøstër

2

Step-by-step explanation:

sin 4A + sin 2A = ?

we know.... sin 2A = 2 sinA.cos A

sin 2(2A) + sin2A

= 2 sin (2A) . cos(2A) + 2sinA.cosA

=2( 2sinA. cosA) . cos 2A + 2sinA.cosA

=4sinA.cosA.cos2A + 2sinA.cosA

= 2sinA.cosA ( 2 cos2A +1)

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