How to use the pythagorean identity to simplify an expression

The video tutorial focuses on simplifying the expression secant squared minus one using trigonometric identities. It introduces the Pythagorean identity and demonstrates how to manipulate equations similarly to linear equations. The tutorial includes classroom instructions and concludes with an example of simplifying the expression to tangent squared of Theta.

How can secant squared of Theta minus one be simplified?

What does tangent squared of Theta equal in terms of secant squared?