Question

determine o valor de: y=3cos540°-2sen90°+tag 180°

Answer 1

cos540 = cos180 = - 1
sen90 = 1
tg180 = 0

y = 3cos540 - 2sen90 + tg180
y = 3.(-1) - 2.1 + 0
y = - 3 - 2
y = - 5