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arg 의 아크 사인(arc sine) 라디안으로 값을 반환한다.
returns the arc sine of arg in radians. asin() is the complementary function of sin(), which means that a==sin(asin(a)) for every value of a that is within asin() 's range.
arg 의 아크 코사인(arc cosine) 값을 라디안으로 반환한다.
returns the arc cosine of arg in radians. acos() is the complementary function of cos(), which means that a==cos(acos(a)) for every value of a that is within acos() 'range.
f_dupfd - finds the lowest numbered available file descriptor greater or equal than arg and returns them.
f_dupfd - finds the lowest numbered available file descriptor greater or equal than arg and returns them.
f_setfl - sets the file descriptors flags to the value specified by arg, which can be o_append,o_nonblock or o_async. to use o_async you will need to use the pcntl extension.
to use o_async you will need to use the pcntl extension.