## TRIGONOMETRIC RATIOS OF ALLIED ANGLES

Two angles are allied if their sum or difference is a multiple of 90o.

If is any angle, then etc are called as allied angles.

General trigonometric ratios and allied terms are listed below:

Example:

The value of trigonometric function  is;

We know that, , then;

Question 1:

Find the value of trigonometric function

Solution

We know that, , then;

Question 2:

Find the value of trigonometric function

Solution

is written as

Known that, , then;