Trigonometry Identities

Trigonometry identities are used regularly in common trigonometry questions. Thus it's essential to remember these trigonometry identities well. If you are still uncertain , please go to trig identities to revise. In this course, we shall look at how to apply trigonometry identities in common problems.

Examples

a) Find the exact value of

We use the supplementary angles found within trigonmetry identities to simplify the expression. Try figuring it out yourself.

= equation showing the use of trigonometry identities

Then , we convert these trigonometry functions into its numerical value. We will learn more about this with the help of trig tables.

= = =

b) Show that

We make use of the double angle

LHS =

=

= RHS (shown)

Return to Trigonometry Help or Basic Trigonometry .