To solve an equation of the form\(a\cos x + b\sin x = c\)you must always rewrite the left hand side into one of the forms\(k\cos (x \pm \alpha )\) or \(k\sin (x \pm \alpha )\)before you can solve it.

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