周期:T=n/W
=>T=n/2
定义域:
tanW的定义域{W|W≠Kn+n/2}(K∈Z)
=> 2x≠Kn+n/2 => x≠Kn/2+n/4
=>函数定义域{x|x≠Kn/2+n/4)(K∈Z)
值域:
(+∞,-∞)