Multiply and verify the trigonometric identity

The video tutorial explores a mathematical problem involving multiplication and the use of Pythagorean identities. It begins by identifying multiplication in the problem and applies the difference of squares. The tutorial then demonstrates how to use Pythagorean identities with different variables, leading to the simplification of expressions. The final part explains how to simplify expressions using identities, showing that one over secant is equivalent to cosine.

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