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This lesson will introduce the use of sin, cos, and tan operations, and teach how to apply them in triangles. Sign onto ClassZone.com. The following website introduces the concepts of a reference angle, adjacent sides, opposite sides, and the hypotenuse: Sides of a Right Triangle A Trigonometric Ratio is the ratio of lengths of two sides in a RIGHT triangle. There are three kinds: Sin, Cos, and Tan. Here is how each ratio, sin, cos, tan, is ...
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