Final answer:
Trigonometric functions can be evaluated for different values of θ by using special ratios.
Step-by-step explanation:
Trigonometry involves the study of the relationships between angles and the lengths of the sides of triangles. There are six trigonometric functions: sine, cosine, tangent, cosecant, secant, and cotangent. These functions can be evaluated for different values of θ by using special ratios.
For example, to evaluate the sine function, divide the length of the side opposite the angle by the length of the hypotenuse. To evaluate the cosine function, divide the length of the side adjacent to the angle by the length of the hypotenuse. Similarly, the tangent function is the ratio of the opposite side to the adjacent side.