Each question in this quiz is timed.
Calcular (tg135-tg143)/(tg143 . tg135)
2/3
-1/3
3/4
-2/3
calcular (ctg49π/45)/(csc41π/45) + cos(41π/45)/ctg(49π/45).
23/4
17/25
25/17
5/7
calcular ( 2tg(180-a)+ 5ctg(270-a))/(tg(360-a) +2 ctg(90+a))
2
-2
-1
1
0
