KHẲNG ĐỊNH NÀO SAU ĐÂY LÀ ĐÚNG

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Level:

Medium

Question Types: Multiple choice

Answers:

- $ \\\int {\\\frac{1}{{{{\\\cos }^2}x}}dx = - \\\cot x + C}$ .

- $ \\\int {{a^x}dx = {a^x}.\\\ln a + C}$ .

- $ \\\int {{e^x}dx = \\\frac{1}{{{e^{ - x}}}} + C}$ .

- $ \\\int {\\\frac{1}{x}dx = - \\\frac{1}{{{x^2}}} + C}$ .