void setup() {
int i1,i2;
float f1,f2;

Serial.begin(9600);

Serial.println(pow(4,1/2));

Serial.println(pow(4,1/2.0));

Serial.println(pow(4,0.5));

Serial.println((pow(7,1/5.0)),4);

Serial.println(PI,4);

Serial.println (cos(2*PI)+long(2));
}

void loop() {
  // put your main code here, to run repeatedly:

}