cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
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cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
两角差的余弦=cos(2x -π/5)
cos2x cosπ/5+sin2x sinπ/5
=cos(2x-π/5)
cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
两角差的余弦=cos(2x -π/5)
cos2x cosπ/5+sin2x sinπ/5
=cos(2x-π/5)