| Exam Board | SPS |
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| Module | SPS FM (SPS FM) |
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| Year | 2020 |
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| Session | June |
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| Topic | Addition & Double Angle Formulae |
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4.
Use the identity for \(\tan ( A + B )\) to show that
$$\tan 3 \theta \equiv \frac { 3 \tan \theta - \tan ^ { 3 } \theta } { 1 - 3 \tan ^ { 2 } \theta }$$