int buzzerPin = 9;
float sinVal;
int toneVal;

void setup() {
  // put your setup code here, to run once:
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int x = 0; x < 360; x++){
    sinVal = sin(x*(PI / 180));
    toneVal = 2000 + sinVal * 500;
    tone(buzzerPin, toneVal);
    delay(1);
  }
}