Definition Of Circular Functions

Circular Functions are functions that are defined using a unit circle.

Example of Circular Functions

The functions sine, cosine, tangent, secant, cosecant, and cotangent are examples of circular functions

Video Examples: Circular Functionss

Solved Example onCircular Functions

Ques: State the signs of sin θ and cos θ for values of θ in the given interval (0,).

Choices:

A. +, -
B. +, +
C. -, -
D. -, +
Correct Answer: B

Solution:

Step 1: Let θ be any angle and P(x, y) be any point on the terminal side of the angle in the interval (0, ).
Step 2: Let r denote the distance from P(x, y) to the origin. Then .
Step 3:

Step 4:. Both are positive, i.e. +, +.

 

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