From help(Trig)
:
Angles are in radians, not degrees, for the standard versions (i.e., a right angle is π/2), and in ‘half-rotations’ for
cospi
etc.
> cos(pi)
[1] -1
> cos(2*pi)
[1] 1
Mind that:
> pi
[1] 3.141593
solved cos/sin/tan function gives different result than my calculator [closed]