I need help with SINE, COSINE, and TANGENT formulas.?

I need to know what are the exact number sine, cosine, and tangent equal. Like how pi is 3.14..... Also how to use it. Its for my CST that's coming up and i can't just input this into my calculator I would've asked my geometry teacher but he won't tell me now because I forgot to bring my book to class today, so please somebody help me I don't have much time.