The inverse function of cos is cos⁻¹. The inverse function of tan is tan⁻¹. To find the value of \(Ɵ\), calculate sin⁻¹ or cos⁻¹ or tan⁻¹ of the fraction on the right hand side.

To find the value of \ ... 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.