Question

Calcule:
A) Sen 270 graus - sen 180 graus + cos 90 graus
B) Tg 180 graus + cos 180 graus - sen 180 graus
C) 3sen 90 graus + 2cos 180 graus + sen 30 graus

Answer 1

a) sen270 - sen180 + cos90
- 1 - 0 + 0 = - 1

b) tg180 + cos180 - sen180
0 + ( -1) - 0 = - 1

c) 3sen90 + 2cos180 + sen30
3*1 + 2*(-1) + 0,5 =
3 - 2 + 0,5 = 1,5