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Yogita Ingle 2 years, 2 months ago
tan10°tan15°tan 75° tan80°
= tan10 tan15 tan(90-75) tan (90-80)
= tan10 tan15 cot 15 cot10
as we know tan theta * cot theta = 1
so
tan10 cot10 tan15 cot 15
= 1
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Shamshad Ali 2 weeks, 4 days ago
1Thank You