Respuesta:
[tex] = \frac{1}{ { \cos ^{2} (x) } } - \frac{ \sin^{2} (x) }{\cos^{2} (x)} - { \cos}^{2} (x) \\ = \frac{1 -\sin^{2} (x)}{\cos^{2} (x)} - \cos^{2} (x) \\ = \frac{\cos^{2} (x)} {\cos^{2} (x)} - \cos^{2} (x) \\ = 1 - \cos^{2} (x) \\ = \sin^{2} (x)[/tex]
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Respuesta:
[tex] = \frac{1}{ { \cos ^{2} (x) } } - \frac{ \sin^{2} (x) }{\cos^{2} (x)} - { \cos}^{2} (x) \\ = \frac{1 -\sin^{2} (x)}{\cos^{2} (x)} - \cos^{2} (x) \\ = \frac{\cos^{2} (x)} {\cos^{2} (x)} - \cos^{2} (x) \\ = 1 - \cos^{2} (x) \\ = \sin^{2} (x)[/tex]