Im currently in Calc II and am finding myself totally lost when it comes to solving things like sin(pi/3) and trig of that nature. I am very reliant on my calculator and am extremely fond of degrees, but I NEED to be able to find the definite integral of cos(x) from 0 to (pi/3) and problems that are similar. I was hoping that someone could help explain how this works. Its something I really should know how to do, but I dont know where else to go to learn. Thanks in advance guys.