Với hàm số $y=co{t}^2\frac{x}{4}$ thì nghiệm của phương trình y'=0 là: 

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Your genes ___________ your shape, size and so on.
  
  

• Choose the best answer for the following sentence:

  
  If you want to buy a new car, you should choose an ___________car to run. It can save your money.
  
  

• Choose the best answer for the following sentence:

  They both have brown eyes because the brown gene is ____________.
  
  

• Choose the best answer for the following sentence:

  
  The doctor examined him and __________ that he ____________his arm.
  
  

• Choose the best answer for the following sentence:

  Nam said to me: “I work for your sister's company."
  -> Nam told me ___________ worked for ____________ sister's company.”
  
  

• Choose the best answer for the following sentence:

  I had the roof _____________ yesterday.
  
  

• Choose the best answer for the following sentence:

  We couldn't understand the teacher if he _____________ too fast.
  
  

• Find a mistake in the four underlined parts of the sentence and correct it:

  The woman is talking to Jim is Australian.

• Choose the word that has the underlined part pronounced differently from the rest:  

  took                      look                       blood                          good

• Choose the word that has the underlined part pronounced differently from the rest:  

  economic                   equal                    ethic                       evening