Lesson Seven: Fundamental Trigonometric Identities

Key Concepts

Reciprocal Identities

Quotient Identities

Pythagorean Identities

Cofunction Identities

Even/Odd Identities

While the majority of these identities should be familiar by now, the Pythagorean Identities are new. So, let's examine them.

Using GSP to Verify the Pythagorean Identities

Consider the following construction:

Now, take a look at this.

To manipulate the file that created these sketches, click here.

OR, if you don't have GSP, click here for a web page that shows the construction, but not the identities.

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Go on to Lesson Eight

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