Trigonometry - Exact Trigonometric Values and the Unit Circle

Trigonometry - Exact Trigonometric Values and the Unit Circle

Given that \(\tan \theta = -\frac{1}{2}\) and \(\cos \theta < 0\), find the exact values of \(\cos \theta\) and of \(\sin \theta\).

Video Solution:

Video solution locked

A free account saves your progress; this video needs a course plan.

Create free account Sign in Get the A Math course · from S$39.98/mo

Solution:

Solution locked

680+ questions here come with free worked solutions. A free account saves your questions and progress; this one needs a course plan.

Create free account Sign in Get the A Math course · from S$39.98/mo A Math tuition

Create a free account to practise similar questions.

Create free account Sign in Get the A Math course · from S$39.98/mo A Math tuition

Answer:\(\cos\theta=-\frac{2\sqrt{5}}{5}\), \(\sin\theta=\frac{\sqrt{5}}{5}\)

Need help? Join our A-Maths tuition classes.