Food for thought

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## Problem

• If $\tan A=\tan B$, what can we say about $A$ and $B$?

What about the corresponding questions for sine and cosine?

• If $\cos A=\cos B$, what can we say about $A$ and $B$?

• If $\sin A=\sin B$, what can we say about $A$ and $B$?

Suggestion: Think about the graphs of the trigonometric functions!