Question

sin2A. COSA + cos2A. sinA = sin4A.COSA - COS4A.​

Answer 1

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Answer 2

Step-by-step explanation:

sin 2A. cos A + Cos 2A .Sin A

= Sin (2A + A)

= Sin 3A

Again,

Sin 4A. cos A - cos 4A .Sin A

= Sin (4A-A)

= Sin 3A

Hence,proved

Hope it will help you.....