a.

\(y'=cos\left(3x+\dfrac{\pi}{2}\right).\left(3x+\dfrac{\pi}{2}\right)'=3cos\left(3x+\dfrac{\pi}{2}\right)=-3sin3x\)

b.

\(y'=-sin\left(3x-\dfrac{\pi}{6}\right).\left(3x-\dfrac{\pi}{6}\right)'=-3sin\left(3x-\dfrac{\pi}{6}\right)\)

a,\(y=sin\left(3x+\dfrac{\pi}{2}\right)\)

\(\Leftrightarrow\left(3x+\dfrac{\pi}{2}\right)'cos\left(3x+\dfrac{\pi}{2}\right)\)

\(\Leftrightarrow3cos\left(3x+\dfrac{\pi}{2}\right)\)

b,\(y=cos\left(3x-\dfrac{\pi}{6}\right)\)

\(\Leftrightarrow-\left(3x-\dfrac{\pi}{6}\right)'sin\left(3x-\dfrac{\pi}{6}\right)\)

\(\Leftrightarrow-3sin\left(3x-\dfrac{\pi}{6}\right)\)

1 Will robots be more intelligent than Humans?

2 We shouldn't overuse water and electricity

3 If I have a chance, i will discover the Sahara desert

3. Robots will never be more intelligent than humans.

4,We shouldn't overuse water and electricity.

5. If I have a chance I will discover the Sahara desert.

câu A nha 

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3. A

4. A

5. C

6. B

The main charater is a girl named Tam, her life was full of sorrow and misery but at the end she had found the happiness in her life. She was motherless, and after her father was gone, she lived with sterpmother's control.
With the god's help. Tam became the Queen but her sterpmother did not leave her alone. She tried to kill Tam and had some successful time. But finnally Tam came back to her life. Meanwhile, the King found Tam was not died and took her home. And this time, she fought back to her stepmother. Afterall, her stepmother and her sterpmother's daughter died.

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