Evaluate:cot37/tan53
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2 tan 53˚/cot 37˚ – cot 80˚/tan 10˚
= 2 tan 53˚/cot (90˚ – 53˚) – cot 80˚/tan(90˚ – 80˚)
= 2 tan 53˚/tan 53˚ – cot 80˚/cot 80˚
= 2 – 1
= 1
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