化简sin^2(3θ)-cos^2(3θ)

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化简sin^2(3θ)-cos^2(3θ)化简sin^2(3θ)-cos^2(3θ)化简sin^2(3θ)-cos^2(3θ)sin²(3θ)-cos²(3θ)=-[cos

化简sin^2(3θ)-cos^2(3θ)
化简sin^2(3θ)-cos^2(3θ)

化简sin^2(3θ)-cos^2(3θ)
sin²(3θ)-cos²(3θ)
= -[cos²(3θ)-sin²(3θ)]
= -cos(6θ)