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Sin8a/sin2a=4cos2acos4a.plzz help me to prove this identity

Sin8a/sin2a=4cos2acos4a.plzz help me to prove this identity

Grade:11

1 Answers

Ankit Jaiswal
165 Points
5 years ago
Hi Aniket,
I hope this helps 
sin8a/sin2a
=2(cos4a)(sin4a)/sin2a                                                    [use sin 2a identity]
=2(cos4a)2(cos2a)(sin2a)/sin2a
=4cos2acos4a
henc proved

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