I have seen these math.sin,math.cos in some scripts, searched the wiki but it still confuses me, what are these math functions and what are they useful for?
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What does math.sin, math.cos means?
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These functions are like the functions you use on a calculator, with sin, cos, and tan. These functions in short are use to calculate the angles and sides of a triangle, if you would like to learn how to utilize these functions, trigonometry is the category these functions fall in.
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math.cos(x) returns the cosine of x and math.sin(x) returns the sine of x. For example, if x in math.sin was 1 radian, it would return 0.8414709848. If x in math.cos was 1 radian, it would return 0.54030230586.