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Show that cos40cos80cos160=-1/8

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Show that cos40cos80cos160=-1/8

Posted by Anshika Singh 4 years, 11 months ago

CBSE > Class 11 > Mathematics

2 answers

Anshika Singh 4 years, 11 months ago

Mujhe samajh ni aaya

0Thank You

Ranjeet Kumar 4 years, 11 months ago

We have cos40°cos80°cos160° =>{(2sin40°cos40°)cos80°cos160°} /2sin40° =>{(2sin80°cos80°)cos160°} /4sin40° =>{2sin160°cos160°}/8sin40° =>sin320°/8sin40° =>sin(360°-- 40°)/8sin40° => -- sin40°/8sin40° => --1/8

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