Apply the trigonometric identity: $1-\sin\left(\theta \right)^2$$=\cos\left(\theta \right)^2$
$\tan\left(x\right)^2\cos\left(x\right)^2$
Why is 1 - sin(x)^2 = cos(x)^2 ?
Final answer to the problem
$\tan\left(x\right)^2\cos\left(x\right)^2$
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Simplification of trigonometric expressions consists of rewriting an expression with trigonometric functions in a simpler form. To perform this task, we usually use the most common trigonometric identities, and some algebra.