If \( H \) is the orthocentre of triangle \( A B C \), then \( A H \) is equal to....

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If \( H \) is the orthocentre of triangle \( A B C \), then \( A H \) is
\( \mathrm{P} \)
equal to
(1) \( 2 R \cos A \)
(2) \( 2 R \sin A \)
(3) \( a \cot A \)
(4) \( \frac{2 a b c}{\Delta} \cos A \).


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