Triangles : Prove a Trigonometric Relation -- (b +c )cos A+(c +a) cos B+ (a + b)cos C=a+b+c
Not what you're looking for?
In any triangle ABC, prove that (b +c )cos A+(c +a) cos B+ (a + b)cos C=a+b+c.
See the attached file.
Purchase this Solution
Solution Summary
A trigonometric relation involving triangles is proven in the given solution.
Solution Preview
Formula required: Projection Formula
Projection Formula: In any triangle ABC, a=b ...
Purchase this Solution
Free BrainMass Quizzes
Exponential Expressions
In this quiz, you will have a chance to practice basic terminology of exponential expressions and how to evaluate them.
Probability Quiz
Some questions on probability
Graphs and Functions
This quiz helps you easily identify a function and test your understanding of ranges, domains , function inverses and transformations.
Know Your Linear Equations
Each question is a choice-summary multiple choice question that will present you with a linear equation and then make 4 statements about that equation. You must determine which of the 4 statements are true (if any) in regards to the equation.
Multiplying Complex Numbers
This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.