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If you mean the actual calculation of the sine and cosine functions, this is so involved that you best leave it to a scientific calculator. In both cases, infinite series are used. The formula for the sine function is:

sin x = x - x3/3! + x5/5! - x7/7! ...

Similarly:

cos x = 1 - x2/2! + x4/4! - x6/6! ...

"x" must be in radians. The formulae converge rather quickly, at least for small values of "x", but you still need to do a lot of calculations.

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Q: What is the procedure for figuring out the sin and cosin ratios?
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