Trigonometry at this level includes exact values, identities and solving trig equations.
Key exact values: $\sin 30°=0.5$, $\cos 60°=0.5$, $\tan 45°=1$, $\sin 90°=1$. A key identity is $\sin^2\theta+\cos^2\theta=1$.
Remember
- $\sin^2\theta+\cos^2\theta=1$.
- $\tan 45°=1$, $\sin 90°=1$.