cos2A^2+sin2A^2=3.求A

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cos2A^2+sin2A^2=3.求A

cos2A^2+sin2A^2=3.求A
cos2A^2+sin2A^2=3.求A

cos2A^2+sin2A^2=3.求A
(cos2A)^2+(sin2A)^2=1
是恒定的
而不是=3

“^”是什么