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How to find value

Cos(10).cos(20).cos(40)=?
 
Angles are in Degree 
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1 Answer

The problem looks like the product of three cosines whose angles are known.  Use your calculator to find the values of cos(10o), cos(20o) and cos(40o) then multiply the values together.

Comments

I can't use calculator ! this is not the way of solving problem ! Please Solve it in step by order