f(0)=2,
f'(x)=e^x-e^(-x)=(e^2x-1)/e^x,when x>0,f'(x)>0,so f(x) increase with x; else,f'(x)
我已知到它是偶函数,可图像该怎么画?
0,f'(x)>0,so f(x) increase with"}}}'>
f(0)=2,
f'(x)=e^x-e^(-x)=(e^2x-1)/e^x,when x>0,f'(x)>0,so f(x) increase with x; else,f'(x)