Rewrite a sentence with if for each situation:

1. Tell your parents the truth. I'm sure they will believe you.

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2. I only came up the stairs because the lift wasn't working.

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3. We didn't listen carefully; perhaps that's why we made this mistake.

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4. George wasn't able to answer the question, so he got a bad mark.

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5. We got stuck in the traffic jam so we were late for the show.

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6. People don't realize how improtant it is to converse energy, so they do nothing about it.

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7. At the time of accident i was sitting in the back of the car because Tom was sitting in front.

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Mọi người giúp mình vớii. Mình cảm ơn nhiều lắmm!

Rút gọn biểu thức:

C= \(cos^4x+cos^2x.sin^2x+sin^2x\)

D= \(\sqrt{sin^2x\left(1+cotx\right)+cos^2x\left(1+tanx\right)}\)

Chứng minh đẳng thức sau:

\(\left(\frac{sinx+cotx}{1+sinx.tanx}\right)^n\) =\(\frac{sin^nx+cot^nx}{1+sin^nx.tan^nx}\)

Rut gon bieu thuc:

A=(sin⁴a+cos⁴a-1)/(sin⁶a+cos⁶a-1)

B=1-sin²a+cos²a

C= 1-sina.cosa.tana

D= cos⁴a+cos²a.sin²a+sin²a

E=cansin²a.(1+cotx)+cos²a(1+tana)

F= 1+sina/cosa.[1-(1-sina/cosa)²]

Ai giup minh voiii. Minh cam on nhieuu!

Tinh cac gia tri bieu thuc sau:

A= (cota+tana)/(cota-tana) voi sina=3/5

B= (sin^2a-cos^2a)/(sin^2a-3cos^2a) voi cota=-1/3

C1=sin^2a+2cos^2a va C2= sin^4a-cos^4a voi tana=-2

Ai giup minh voii. Minh cam on nhieuu!