a = 9
a
## [1] 9
b = 27+9
b
## [1] 36
c = 6*9
c
## [1] 54
d = a/2
d
## [1] 4.5
x <- 2 +9
2 + 4 -> x
x
## [1] 6
z <- 2 + 4
8 + 2 -> z
z
## [1] 10
e = sin(20)
e
## [1] 0.9129453
f = cos(20)
f
## [1] 0.4080821
g = tan(20)
g
## [1] 2.237161