hey guys, I'm sorry if this is a repost. I'm studying for the physics portion as we speak, and finding angles with arctan and whatnot- how do I do this without a calculator? for sin and cos.. I know the trig functions but getting it to a decimal, rather than keeping it in a square root- How do I do THIS without a calculator? All the questions I'm using for practice convert the answers to decimals. How is it like on the test (if I may ask)?