# R program to evaluate an expression
  
# Calling eval() Function
eval(sin(pi / 3))
eval(5 + 2)
eval(cos(2))

[1] 0.8660254
[1] 7
[1] -0.4161468

# R program to evaluate an expression
  
# Creating a vector
x <- c(1, 2, 3)
  
# Creating a matrix
mat <- matrix(c(2, 7, 5, 7), 2)
  
# Calling eval() function
eval(x * 2)
eval(det(mat))

[1] 2 4 6
[1] -21