The cosine (cos) function takes the angle Ɵ and gives the answer to adjacent ÷ hypotenuse (in this example, 16/32). cos⁻¹ is the inverse function of cos. The cos⁻¹ function takes the ...

Here is an example of how to calculate the length of a side, \(y\), when another side and an angle Ɵ is given in a right-angled triangle. 11 m should be labelled as adjacent (\(a\)) and \(x ...