Question

Calcular : E = 2 cos 120º + 4 tan 217º.

Answer 1

E = 2cos(90+30) +4tan(180+37)
E = 2sen30° + 4tan37°
E = 2(1/2) + 4(3/4)
E = 1+3
E = 4 <== Rpta :)