dis gives cosa=sin^2a now lhs=sin^12 a + 3 sin^10 a + 3 sin^8 a + sin^6 a + 2 sin ^ 4 a + 2 sin^2 a - 2 =cos^6a + 3 sin^10 a + 3 sin^8 a + sin^6 a + 2 cos^2 a + 2 sin^2 a - 2 =cos^6a+sin^6a+3cos^5a+3sin^8a+2-2 =1-3cos^3a+3cos^5a+3cos^4a =1-3cos^3a(sin^2a)+3 cos ^4 a =1
nobody is wrong
even a stopped clock is right twice a day
Moderation Team
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