関連ワード:  integration of cos4x dx    integration of sin3x cos4x dx    integration of sin4x cos4x dx    integration of sin2x cos4x dx    integration of cos4x cosx dx    integration of cos4x cos3x dx    integration of cos2x cos4x dx    integration of cos4x cos5x dx    integration of sinx cos4x dx    integration of cos4x cos7x dx