Ask a question

How to find value

Angles are in Degree 

1 Answer by Expert Tutors

Tutors, sign in to answer this question.
Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
5.0 5.0 (428 lesson ratings) (428)
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.


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