a = 10 a
## [1] 10
b = 5+15 b
## [1] 20
c = 18*3 c
## [1] 54
d = (a+b)/2 d
## [1] 15
x <- 9+10 8+6 -> x x
## [1] 14
e = sin(45) e
## [1] 0.8509035
f = cos(90) f
## [1] -0.4480736
g = tan(30) g
## [1] -6.405331