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Some students just don't take the time to memorize the outputs of the trigonometric operations on the more common angles. If you can memorize the values of the trig functions on the angles 0, 30, 45, 60 and 90 degrees (0, pi/6, pi/4, pi/3 pi/2 radians), you will save a ton of time on trigonometry, precalculus, calculus and physics assignments/tests. Here's a demonstration of a pattern... read more