请问lim x→0 (cosx-cos3x)/x的平方等于?lim x→0 (cosx-cos3x)/x的平方请写好步骤!
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请问lim x→0 (cosx-cos3x)/x的平方等于?lim x→0 (cosx-cos3x)/x的平方请写好步骤!
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