IB skill practice

Solve trigonometric equations

Solve exact trigonometric equations over a specified interval using reference angles and quadrant signs.

Paper 1 5 marks Difficulty 3

Solve an exact trigonometric equation in degrees

Solve \(cos\theta=\frac{1}{2}\) for \(0^\circ\leq \theta<360^\circ\). Enter the two values of \(\theta\) in degrees.

Worked practice: trigonometric equation

Use the reference angle and quadrant information to list the solution angles.