问题
填空题
函数f (x)＝cosx－sinx（x∈[－π,0]）的单调递增区间为_____________
答案
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函数f (x)＝cosx－sinx（x∈[－π,0]）的单调递增区间为_____________
| 情景交际。 | |
| Sam: Hi, Joan, __1__? Joan: It was pretty great. Sam: __2__? Joan: No, I didn't. __3__. Look, here are my photos. Sam: __4__? Joan: No, there weren't any sharks, but there were really clever seals. Sam: Wow, __5__. What else did you do? Joan: Well, I had a long walk with my friends and took lots of beautiful photos.
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