[2sin A cos^(3)A-2sin^(3)A*cos A=],[(A)sin4Aquad (B)(1)/(2)sin4Aquad (C)(1)/(4)sin4Aquad (D)" None of these "]

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sin4A=4cos^(3)A sin A-4sin^(3)A cos A

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2sin ^ (2) A + cos ^ (4) A-1 + sin ^ (4) 4

sin4A = 4sin A cos ^ (3) A-4cos A sin ^ (3) A

sin4A = 4sin A * cos ^ (3) A-4cos A * sin ^ (3) A

sin^4A-cos^4A=2sin^2A-1=1-2cos^2A=sin^2A-cos^2A

If cos A+cos^(2)A=1, then sin^(2)A+sin^(4)A=-1(b)0(c)1(d) None of these

cos^(4)A-sin^(4)A is equal to 2cos^(2)A+1(b)2cos^(2)A-1(c)2sin^(2)A-1( d) 2sin^(2)A+1

If cosA+cos^2A=1 , then sin^2A+sin^4A= (a) -1 (b) 0 (c) 1 (d) None of these

cos A + cos B + cos C = 1 + 4sin ((A) / (2)) sin ((B) / (2)) sin ((C) / (2))