Simplify expressions using fundamental identities

The video tutorial explains how to simplify a trigonometric expression involving secant squared of X minus 1. The instructor uses Pythagorean identities and trigonometric identities to transform the expression into a simpler form. The process involves substituting secant squared of X minus 1 with tangent squared of X and further simplifying using quotient identities. The final result is the sine squared of X. The tutorial concludes with a call to action for viewers to subscribe.

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