Show that : sin A cos A - sin A cos(90° - A) cos A \ sec (90° - A) - cos A sin(90° - A) sin A\cosec(90° - A) = 0

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Express cosec 68° + cot 72° in terms of angles between 0° and 45°.

Evaluate :
3 cos 80° cosec 10° + 2 sin 59° sec 31°