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[" I-2.If "sin theta+sin^(2)theta=1," th...

[" I-2.If "sin theta+sin^(2)theta=1," then prove that "cos^(12)theta+3cos^(10)theta+3cos^(8)theta+cos^(6)theta-1=0],[qquad *cin^(2)A=cos^(2)theta]

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