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If you have a right angled triangle, then:

sin(angle) = opposite_side/hypotenuse

Otherwise, if the angle (x) is expressed in radians, it can be calculated by the infinite sum:

sine(x) = x - x3/3! + x5/5! - x7/7! + ...

where the rth term (r ≥ 1) is:

x(2r-1)/(2r-1)! (-1)r-1

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Q: How do you calculate the sine of an angle?
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