若x=π/12,则sin^4x-cos^4x=?
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若x=π/12,则sin^4x-cos^4x=?若x=π/12,则sin^4x-cos^4x=?若x=π/12,则sin^4x-cos^4x=?若x=π/12,则sin^4x-cos^4x=?sin&
若x=π/12,则sin^4x-cos^4x=?
若x=π/12,则sin^4x-cos^4x=?
若x=π/12,则sin^4x-cos^4x=?
若x=π/12,则sin^4x-cos^4x=?
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