TÍNH $ I = \INT {X\COS 2XDX}$ LÀ:

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Level:

Medium

Question Types: Multiple choice

Answers:

- $ I = \\\sin 2x + C.$

- $ I = \\\frac{1}{2}x\\\sin 2x + \\\frac{1}{4}\\\cos 2x + C.$

- $ I = \\\frac{1}{2}x\\\sin 2x + \\\frac{1}{2}\\\cos 2x + C.$

- $ I = \\\frac{{{x^2}\\\sin 2x}}{4} + C.$