It's no use ____ ( complain). You should think of ways to do with it.
①f(x)是偶函数;
②f(x)是周期函数,且最小值周期为π;
③f(x)的单调递减区间为k,k+1)(k∈Z);
④f(x)的值域为cos1,1).
其中正确的个数为( )
That is __________ sweater.
按拼音写汉字。
gū ér
yī shang
zhōu dào
____