Question

calcule o valor da expressao : y= tg pi - sen pi/2 + cos pi ÷ cos 3pi/2- sen 3pi/2

Answer 1

Y=(0-1-1)/(0-(-1)= -2/1   Y=-2

Answer 2

$y = tgπ - sen\frac{π}{2} + \frac{cosπ}{ cos\frac{π}{2} } - sen\frac{3π}{2}$$y = 0 - 1 + \frac{0}{0} - (- 1)$ 
$y = - 1 + 1$
$y = 0$