C :: Arduino Programming - Control Motion Of Servo Motor

I am working on a project that requires using an arduino microcontroller to control the motion of a servo motor. The arduino language is pretty much C.

The original code is of the form:

Code:
#include <Servo.h>

Servo myservo; // create servo object to control a servo
// a maximum of eight servo objects can be created

int pos = 0; // variable to store the servo position

[Code] .....

But the problem is I don't want the motor's motion to behave linearly (constant increments of the pos variable). My desired motion is a sinusoidal like function. How to approach this?

I am quite new to programming, especially with microcontrollers. My guess is that instead of the pos+=1, I would need something like pos+=sin(argument). I am not sure what that argument should be.