the value of tan 10degree tan 15 degree tan 75 degree tan 80 degree is
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Step-by-step explanation:
tan10 tan15 tan75 tan80 = tan10 tan15 cot15 cot10 [tan(90-x) = cotx]
= tan10 cot10 tan15 cot15 [ tanx cotx = 1]
= 1
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