Cos(10).cos(20).cos(40)=? Angles are in Degree 7/13/2014 | Prasenjeet from Arvada, CO | 1 Answer | 0 Votes Mark favorite Subscribe Comment
The problem looks like the product of three cosines whose angles are known. Use your calculator to find the values of cos(10^{o}), cos(20^{o}) and cos(40^{o}) then multiply the values together. 7/13/2014 | Philip P. Comment Comments I can't use calculator ! this is not the way of solving problem ! Please Solve it in step by order 7/13/2014 | Prasenjeet from Arvada, CO Comment
I can't use calculator ! this is not the way of solving problem ! Please Solve it in step by order 7/13/2014 | Prasenjeet from Arvada, CO
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