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# What is the tangent, cotangent, sine, cosine, secant, casecons? 98
In the school course of geometry trigonometric functions of an acute angle is defined as the relationship of sides of a right triangle. Let OAB is a right triangle with acute angle α. To make it clear, you need to draw a right triangle OAB, identify letters On the corners,And the sides OA, AB and the hypotenuse is S, the acute angle α at the vertex O\r\n\r\togda: \r\n\r\sinocom angle is the ratio the ratio of the opposite leg to the hypotenuse;\r\n\r\casinocom angle is the ratio adjacent side to the hypotenuse;\r\n\r\pangenom angle is the ratio opposite over adjacent;\r\n\r\kotangens angle is the ratio adjacent side to the opposite;\r\n\r\Scancom angle is the ratio of the hypotenuse to the surrounding leg;\r\n\r\pascana angle is the ratio of the hypotenuse to the opposite leg..
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