The tan⁻¹ function takes the answer to opposite ÷ adjacent (in this example, 5/7) and gives the angle Ɵ. To find Ɵ, calculate tan⁻¹ (5/7). Image caption, To write tan⁻¹ on a scientific ...

The angles are labelled with capital letters. The opposite sides are labelled with lower case letters. Notice that an angle and its opposite side are the same letter. The sine rule is: \(\frac{a} ...