Does anybody know how to plot these function on mathematica y = sinx and y = sinx/x on the interval [-2Pi ,2Pi ]?

try Wolfram, it is a powerful source

https://www.wolframalpha.com/input/?i=plot+y+%3D+sinx%2C+y+%3D+sinx%2Fx+from+-2%CF%80+to+2%CF%80