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The acosh() function is a standard library function in C that is used to calculate the inverse hyperbolic cosine of a given value.

The acos() function is a standard library function in C that is used to calculate the arc cosine (inverse cosine) of a given value.

The abs() function is a standard library function in C that is used to calculate the absolute value of an integer.

Math functions in C refer to a set of standard library functions provided by the header.

The strxfrm() function is a standard library function in C that is used for string transformation and collation.

The memset() function is a standard library function in C that is used to fill a block of memory with a specified value.

The memcmp() function is a standard library function in C that is used to compare two blocks of memory.

The memcpy() function is a standard library function in C that is used to copy a block of memory from one location to another.

The memmove() function is a standard library function in C that is used to copy a block of memory from one location to another, even if the memory blocks overlap.

The memchr() function is a standard library function in C that is used to search for a specific byte value within a block of memory.

The strcoll() function is a standard library function in C that is used for string comparison based on the current locale.

The strnset() replaces every character of a string with the symbol given by the programmer up to the specified length.

The strset() replaces every character of a string with the symbol given by the programmer.

The strerror() function is a standard library function in C that is used to convert an error number into a human-readable string representation of the corresponding error message.

The stricmp() function is a non-standard, case-insensitive string comparison function in C.

The strrev() function to reverse a string.

The strdup() function is a standard library function in C that is used to create a duplicate copy of a string.

The strupr() function is used to convert a string to uppercase.