Question

Calcule o valor de sen² alfa+ tg² alfa- cos² alfa, para alfa= TT rad
3

Answer 1

$sin^2\alpha+tan^2\alpha-cos^2\alpha$
$\alpha=\pi$
$sin^2\pi+tan^2\pi-cos^2\pi$
$(0)^2+(0)^2-(-1)^2$
$-(1)$
$\boxed{-1}$