2sin²A+sin²2A怎么化简?
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2sin²A+sin²2A怎么化简?
2sin²A+sin²2A怎么化简?
2sin²A+sin²2A怎么化简?
2sin²A+sin²2A
=(1-cos2A)+(1-cos²2A)
=2-cos2A-cos²2A
sin2A=2sinAcosA
S=2sin²A+4sin²A(1-sin²A)
=6sin²A-4sin^4 A