2x-1 |
2x+1 |
1+y |
1-y |
2-x-1 |
2-x+1 |
1-2x |
1+2x |
2x-1 |
2x+1 |
2 |
2x+1 |
2(2x1-2x2) |
(2x1+1)(2x2+1) |
1 | ||
|
A.[1,+∞) | B.(1,+∞) | C.(-∞,1] | D.(-∞,1) |
1-x |
x+3 |
A.[1,+∞) | B.[-3,+∞) | C.[-3,1] | D.(-∞,1]∪[-3,+∞) |
1 |
2 |
x+3 |
1 |
x+2 |
sinx |
|sinx| |
|cosx| |
cosx |
tanx |
|tanx| |
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