Select all the correct answers. Which statements are true about the functions y=sin, y=cos(x) ,y=tan(x) and ?
1.The amplitudes of , , and are 1.
2.The periods of and are , and the period of is .
3.The domains of , , and are all real numbers.
4.The graphs of and do not have midlines.
5.Both and are increasing on the interval , and is decreasing on that interval