Question

(1+cosX)(1-cosX)/Tan^2X= Cos^2X Ayuda con ese ejercicio.

Answer 1

$\frac{(1+cosx)(1-cosx)}{tg^{2}x } = cos^{2} x$

$\frac{1-cos^{2} }{tg^{2} x} = cos ^{2} x$

$\frac{sen^{2}x }{tg^{2} x} = cos^{2} x$

$\frac{ \frac{sen^{2} x}{1} }{ \frac{sen^{2} x}{ cos^{2} x} } = cos^{2}x$


$cos^{2} x= cos^{2} x$
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