Grade 11Algebra
- Let x, y, z be real numbers such that
. Prove that
- -------------------------------------------------------------------------------------------------------------
1 Answer
mycroft holmes
Using the standard substitution, x = cos A, y = cos B, z = cos C, where A,B,C are angles of a triangle, we have to prove that
(1+cos A)(1+ cos B)(1+cos C)
We have (1+cos A)(1+cos B) =0 which is true)
Similarly (1+cos A cos B)(1+cos C)
Thus we have (1+cos A)(1+ cos B)(1+cos C)
Other Related Questions on algebra
How do you write “the product of 18 and q” as an algebraic expression?
How do you write “the product of 18 and q” as an algebraic expression?
algebra
Last Activity: 2 Years ago