# Arduino-Trigonometry Function

The Trigonometry function can be used to calculate cos, sin, and tan.

For other Arduino functions and libraries, please refer to the following article.

TOC

## Trigonometry Functions

### cos()/Calculates the cosine of the angle

cos()/Calculates the cosine of the angle
• Return: The cos of the angle

The cos() function returns the value calculated by cos-calculating the number specified in the parameter.

### sin()/Calculates the sine of the angle

sin()/Calculates the sine of the angle
• Return: The sin of the angle

The sin() function returns the value calculated by sin-calculating the number specified in the parameter.

### tan()/Calculates the tangent of the angle

tan()/Calculates the tangent of the angle
• Return: The tan of the angle

The tan() function returns the value calculated by tan-calculating the number specified in the parameter.

## Sample Programs (Sample Sketches)

Parts List
1. Arduino Uno
2. USB Cable
3. PC(For Program Writing and Serial Monitor)

### cos()/Calculates the cosine of the angle

void setup() {
Serial.begin(9600);//Initialize serial communication at 9600bps
}

void loop() {
double cal;//Declare "cal" as a variable with double

cal = cos(0);//Calculate cos0(cos0°) , Assign 1.00 to cal
Serial.print("cos0: ");//Send string "cos0: "
Serial.println(cal);//Send number "1.00", New line

cal = cos(PI/2);//Calculate cosπ/2(cos90°) , Assign -0.00 to cal
Serial.print("cosπ/2: ");//Send string "cosπ/2: "
Serial.println(cal);//Send number "-0.00", New line

cal = cos(PI);//Calculate cosπ(cos180°) , Assign -1.00 to cal
Serial.print("cosπ: ");//Send string "cosπ: "
Serial.println(cal);//Send number "-1.00", New line

cal = cos(PI*3/2);//Calculate cos3π/2(cos270°) , Assign 0.00 to cal
Serial.print("cos3π/2: ");//Send string "cos3π/2: "
Serial.println(cal);//Send number "0.00", New line

cal = cos(PI*2);//Calculate cos2π(cos360°) , Assign 1.00 to cal
Serial.print("cos2π: ");//Send string "cos2π: "
Serial.println(cal);//Send number "1.00", New line

delay(1000);//Wait 1sec (1000msec)
}
Serial Monitor Example

cos0: 1.00
cosπ/2: -0.00
cosπ: -1.00
cos3π/2: 0.00
cos2π: 1.00
cos0: 1.00
cosπ/2: -0.00
cosπ: -1.00
cos3π/2: 0.00
cos2π: 1.00

The sample program calculates cos0, cosπ/2, cosπ, cos3π/2, and cos2π and displays them on the serial monitor. note that the parameter of cos() is in rad units, not angles.

### sin()/Calculates the sine of the angle

void setup() {
Serial.begin(9600);//Initialize serial communication at 9600bps
}

void loop() {
double cal;//Declare "cal" as a variable with double

cal = sin(0);//Calculate sin0(sin0°) , Assign 0.00 to cal
Serial.print("sin0: ");//Send string "sin0: "
Serial.println(cal);//Send number "0.00", New line

cal = sin(PI/2);//Calculate sinπ/2(sin90°) , Assign 1.00 to cal
Serial.print("sinπ/2: ");//Send string "sinπ/2: "
Serial.println(cal);//Send number "1.00", New line

cal = sin(PI);//Calculate sinπ(sin180°) , Assign -0.00 to cal
Serial.print("sinπ: ");//Send string "sinπ: "
Serial.println(cal);//Send number "-0.00", New line

cal = sin(PI*3/2);//Calculate sin3π/2(sin270°) , Assign -1.00 to cal
Serial.print("sin3π/2: ");//Send string "sin3π/2: "
Serial.println(cal);//Send number "-1.00", New line

cal = sin(PI*2);//Calculate sin2π(sin360°) , Assign 0.00 to cal
Serial.print("sin2π: ");//Send string "sin2π: "
Serial.println(cal);//Send number "0.00", New line

delay(1000);//Wait 1sec (1000msec)
}
Serial Monitor Example

sin0: 0.00
sinπ/2: 1.00
sinπ: -0.00
sin3π/2: -1.00
sin2π: 0.00
sin0: 0.00
sinπ/2: 1.00
sinπ: -0.00
sin3π/2: -1.00
sin2π: 0.00

The sample program calculates sin0, sinπ/2, sinπ, sin3π/2, and sin2π and displays them on the serial monitor. note that the parameter of sin() is in rad units, not angles.

### tan()/Calculates the tangent of the angle

void setup() {
Serial.begin(9600);//Initialize serial communication at 9600bps
}

void loop() {
double cal;//Declare "cal" as a variable with double

cal = tan(0);//Calculate tan0(tan0°) , Assign 0.00 to cal
Serial.print("tan0: ");//Send string "tan0: "
Serial.println(cal);//Send number "0.00", New line

cal = tan(PI/2);//Calculate tanπ/2(tan90°) , Assign -22877332.00 to cal
Serial.print("tanπ/2: ");//Send string "tanπ/2: "
Serial.println(cal);//Send number "-22877332.00", New line

cal = tan(PI);//Calculate tanπ(tan180°) , Assign 0.00 to cal
Serial.print("tanπ: ");//Send string "tanπ: "
Serial.println(cal);//Send number "0.00", New line

cal = tan(PI*3/2);//Calculate tan3π/2(tan270°) , Assign -83858280.00 to cal
Serial.print("tan3π/2: ");//Send string "tan3π/2: "
Serial.println(cal);//Send number "-83858280.00", New line

cal = tan(PI*2);//Calculate tan2π(tan360°) , Assign 0.00 to cal
Serial.print("tan2π: ");//Send string "tan2π: "
Serial.println(cal);//Send number "0.00", New line

delay(1000);//Wait 1sec (1000msec)
}
Serial Monitor Example

tan0: 0.00
tanπ/2: -22877332.00
tanπ: 0.00
tan3π/2: -83858280.00
tan2π: 0.00
tan0: 0.00
tanπ/2: -22877332.00
tanπ: 0.00
tan3π/2: -83858280.00
tan2π: 0.00

The sample program calculates tan0, tanπ/2, tanπ, tan3π/2, and tan2π and displays them on the serial monitor. note that the parameter of sin() is in rad units, not angles.