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3.2.2: Simplificar expresiones trigonométricas
https://espanol.libretexts.org/Educacion_Basica/Trigonometria/03%3A_Identidades_trigonom%C3%A9tricas/3.02%3A_Aplicaciones_B%C3%A1sicas_de_Identidad_Trig/3.2.02%3A_Simplificar_expresiones_trigonom%C3%A9tricas
\(\dfrac{\cot x \cos x}{\tan (-x) \sin \left(\dfrac{\pi}{2}-x\right)} \rightarrow \dfrac{\dfrac{\cos x}{\sin x} \cdot \cos x}{-\dfrac{\sin x}{\cancel{\cos x}} \cdot \cancel{\cos x}} \rightarrow \dfrac... $\dfrac{\cot x \cos x}{\tan (-x) \sin \left(\dfrac{\pi}{2}-x\right)} \rightarrow \dfrac{\dfrac{\cos x}{\sin x} \cdot \cos x}{-\dfrac{\sin x}{\cancel{\cos x}} \cdot \cancel{\cos x}} \rightarrow \dfrac{\dfrac{\cos ^{2} x}{\sin x}}{-\sin x} \rightarrow \dfrac{\cos ^{2} x}{\sin x} \cdot-\dfrac{1}{\sin x} \rightarrow-\dfrac{\cos ^{2} x}{\sin ^{2} x} \rightarrow −\cot ^2 x$

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