set 1 and 1 1 1 1 1 substitute back 1 1 1 02092016 11 Trigonometric Functions

Set 1 and 1 1 1 1 1 substitute back 1 1 1 02092016 11

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set ? = ? 0 1 = ? ? 0 − ? 0 and ? = 1 ? 0 −? 0 = 1 ? 0 −? 0 = ? 1 ? 0 ? ? 0 ? = ? ? 0 ? + ? ? 0 ? = ? 1 ? 0 ? 1 ? 0 ? substitute back 1 ? 0 − ? 0 1 ? 0 ? 1 ? 0 ? ? 0 ? ?
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02/09/2016 11 Trigonometric Functions Geometric definition of principal trigonometric functions sin 𝜃 = opposite hypotenuse = BC AC cos 𝜃 = adjacent hypotenuse = AB AC tan 𝜃 = opposite adjacent = BC AC = sin 𝜃 cos 𝜃 derived functions sec 𝜃 = 1 cos 𝜃 cosec 𝜃 = 1 sin 𝜃 cot 𝜃 = 1 tan 𝜃 = cos 𝜃 sin 𝜃 𝜃 A B C adjacent opposite Measures of Angle Two basic measures of the angle degree , ° representing a full rotation as 360 ° radian , rad defined in terms of the ratio of arc length to radius 𝜃 = ? ? dimensionless SI unit of angular measure 1 rad = 360 ° 2 ? = 57 ° 18 90 ° 180 ° 360 ° 𝜃 ? ? ?
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