If in doubt, \(k\cos (x - \alpha )\) usually works. These worked examples show the processes you'll need to go through to rewrite an expression in this form. Write \(2\sin x^\circ + 5\cos x^\circ ...

Discuss with students the real world uses of trigonometry touched upon – planning the angle of a plane’s flight, using sundials to work out the position of the Sun. Use the example of the Sun ...