Chapter 10

Trigonometry

Exact trig values, identities and solving trig equations — with an interactive exercise.

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

  • $\sin^2\theta+\cos^2\theta=1$.
  • $\tan 45°=1$, $\sin 90°=1$.

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