ACOS

ACOS helps you return the arccosine of a number in a worksheet. It provides the tools you need to enter the function, review its syntax, and troubleshoot common calculation issues, making your work more efficient and helping you accomplish tasks with ease. With ACOS, you can insert the function through the function dialog, type =ACOS(...) directly in a cell or formula bar, view the syntax ACOS(number), and open detailed help for the function. You can also check parameter issues behind #VALUE! errors, verify references and numeric cell formats when results seem incorrect, and fill or copy the formula across multiple cells while managing relative and absolute references. Whether you're entering a new formula, checking parameters, or applying it to a range, ACOS helps you stay productive. Choose the documentation below that best matches your needs to learn more.