Prove that \( \cos \left(270^{\circ}-A\right)=-\sin A \), and \( \cot \left(270^{\circ}-A\right)...

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Prove that
\( \cos \left(270^{\circ}-A\right)=-\sin A \), and \( \cot \left(270^{\circ}-A\right)=\tan A \)
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