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tan10°tan15°tan80°=?

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tan10°tan15°tan80°=?
  • 1 answers

Yogita Ingle 4 years 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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