Question
Without using trigonometric tables, evaluate.
$5 \sin 70^{\circ} \sec 20^{\circ}-3 \sin 50^{\circ} \sec 40^{\circ}$
$5 \sin 70^{\circ} \sec 20^{\circ}-3 \sin 50^{\circ} \sec 40^{\circ}$
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Answer
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