Topic: TAN function

[Coder]

Hello guys.

I am trying to find the tangent value of the angle 30.0 with Autolisp but it does not give the same value as in Calculator:

Code: [Select]

(defun tan (x)
  (/ (sin x) (cos x))
  )

My example in Autolisp:

Code: [Select]

(* (tan 30.0) 0.275) returns -> -1.76147 which is not correct and it must return: 0.158771324

Could anyone explain why?

Thanks in advance.

[Lee Mac]

sin/cos operate with radians.

[Coder]

sin/cos operate with radians.

Wow thank you Lee. that solved the puzzle. 

[dgorsman]

Quick hint: virtually *all* programming that deals with trig uses radians rather than degrees.

[Coder]

Quick hint: virtually *all* programming that deals with trig uses radians rather than degrees.

Thanks for the constructive input.

[Lee Mac]

Radians are the only meaningful measure of angle. Degrees are essentially arbitrary: there is no more reason to divide the circle into 360 than for its many factors; you could equally divide the circle into 400 and use Grads.