Question
(a) Use your calculator to check that $\tan 50^{\circ}-\tan 40^{\circ}=2 \tan 10^{\circ}$(b) Part (a) is a specific example of a more general identity. State the identity and prove it.
Step 1
The identity states that $\tan A-\tan B=2 \tan (A-B)$, where $A+B=\frac{\pi}{2}$. Show more…
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