We know that the value of cos x repeats after the interval range of 2π, we can write: cos (–1710°) = cos [–1710° + (5 × 360°)]. In trigonometric functions class 11, we are going to study the generalised concepts of the, If rotation of the ray from initial side to the terminal side is (1/360). NCERT Solutions for Class 12 Maths Chapter 2 Inverse Trigonometric Functions 9. By simplifying the above equation, we get. An angle is a measure, which gives the rotation of a ray about its initial position. Considering the unit circle, the six important trigonometric functions are given as follows: The other trigonometric functions in terms of sine and cosine functions are given as follows: Some of the important expressions for the trigonometric functions of the sum and difference of two angles and related expressions are given as follows: Go through the below given trigonometric functions class 11 solved problems: Convert 6 radians into the degree measure. 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