_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.
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If 24x2=84, and 32x3=69, then 13x3=?
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∆DEF is right angled at E. If m∠F = 45°, then find the value of (cosecD - 1/√3).