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tan10°tan15°tan80°=?

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tan10°tan15°tan80°=?

Posted by Manohar Patel 3 years, 5 months ago

UP Board > Class 10 > गणित

1 answers

Yogita Ingle 3 years, 5 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

ANSWER

http://mycbseguide.com/examin8/

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