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Introduction
What is CPP Declarning Variable Type casting Symbolic constants
User-defined Functions
Function prototype Call by Reference Return by Reference Default Arguments
Math Library Functions
ceil(x as float) floor(x as float) fabs(x as float) pow(x as int,y as int) sqrt(x as int) exp(x as int) log(x as float)
Math Library Functions [cont'd]
log10(x as float) sin(x as float) cos(x as float) tan(x as float)
Classes and Objects in CPP
What is Class Structure of Class What is Object
String Class in CPP
append() assign() at() begin() capacity()
tan(x as float) in Math Library Functions of Programming in CPP
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Usage 
The Tangent function is used to return tangent value of the angle given.
Syntax 
tan(angle)
Example
#include <stdio.h>   
#include <math.h>   

int main ()
{

  printf ("The  tangent of degrees =", tan (30) );
  return 0;
}
Output 
The  tangent of degrees = 0.57735026919
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