Solve trigonometric equations in Higher Maths using the double angle formulae, wave function, addition formulae and trig identities.

Double angle formulas are named so because they involve trigonometric functions of double angles, i.e., sin2θ, cos2θ and tan2θ. There are three main double angle formulas as below: where θ is ...

Using the double angle formulae; Equations involving compound angles (extension) ... Let's remind ourselves of what the sine graph looks like so that we can see how many solutions we should be ...