This function is the inverse function of cos in trignometry,and also it is called as cyclometric function.ACOS is described as arcCOS and denoted by cos-1 (x).In ACOS(X) ,x value should be with in -1&1.Here x is in radians. To convert a degree value to radian, multiply 'x' with PI()/180 or use the radians function RADIANS(X) | This function is the inverse function of cos in trignometry,and also it is called as cyclometric function.ACOS is described as arcCOS and denoted by cos-1 (x).In ACOS(X) ,x value should be with in -1&1.Here x is in radians. To convert a degree value to radian, multiply 'x' with PI()/180 or use the radians function RADIANS(X) |