An understanding of the three trigonometric ratios and how to change the subject of a formula is essential ... \(a\) and \(h\) to give cos(49) = 11/\(x\). To remove \(x\) from the denominator ...

We would advise students to not miss out on the following formulas at any cost. 1. sin-1 x = - sin-1 x 2. cos-1 x = π - cos-1 x 3. tan-1 (-x) = -tan-1 x 4. cosec⁻¹(-x) = -cosec⁻¹x 5.

Let’s look at how to use trigonometric identities to calculate missing sides. \({sin~θ} = \frac {opposite} {hypotenuse}\) \({cos~θ} = \frac {adjacent} {hypotenuse ...