Question: i need help for maple exercise

i got problem coz i dont understand nor know what command i need to type in maple, really need help,

Question:

1) find a function for which all critical points are local extrema. plot the function and explain how we can tell from the graph that all the critical points are extrema points.
2) find a function for which none of the critical points are local extrema. plot the function and explain how we can tell from the graph that none of the critical points are extrema points.
3)use maple to find the largest and smallest values of the functions f(x)=2^x*sin(x) on the interval [0,10]
4) use maple to find the smallest value of the function g(x)=(1/x)+x^2 on the interval (0,n)

PS: all of this questions must solve in maple

i dont know how to do it, hope that someone can figure out and help me, thank you very much