#include <library_name>

For example,

iostream for I/O operations or

iomanip for manipulating the output

Let's take a closer look at a new one called cmath.

cmath contains predefined math related functions. The functions (listed in the table) can be used in a program by adding #include <cmath> at the beginning of the source code.

function | description |

abs( x ) | Absolute value of real value x |

pow( x,y ) | x raised to power y |

sqrt( x ) | Square root of x |

ceil( x ) | Least integer greater than or equal to x |

floor( x ) | Greatest integer less than or equal to x |

exp( x ) | Exponential function e^x |

log( x ) | Natural logarithm of x |

log10( x ) | Base 10 logarithm of x |

sin( x ) | Sine of x (in radians) |

cos( x ) | Cosine of x (in radians) |

tan( x ) | Tangent of x (in radians) |

asin( x ) | inverse sine of x |

acos( x ) | Inverse cosine of x |

atan( x ) | Inverse tangent of x |

sinh( x ) | Hyperbolic sine of x |

cosh( x ) | Hyperbolic cosine of x |

tanh( x ) | Hyperbolic tangent of x |

Reference: C++ reference, cpp reference, wikipedia

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