Question

Use the law of cosines to find the value of 2, 3, 4 cos (theta).

Answer 1

The law of cosines is given by
\[a^2 = b^2 + c^2 - 2 bc \cos \left(\angle{A}\right) \]
Where \(a\), \(b\), and \(c\) are the side lengths and \(\angle{A}\) is the angle directly opposite side \(a\).

Notice in the given problem that you are given \(\theta\), which is the angle directly opposite the side length of \(2\). Using this information, you should be able to plug in the relevant numbers to solve for the value of the expression \(2 * 3 * 4 * \cos \theta\).

Answer 2

@DisplayError I got 24cos(theta) for 2*3*4*cos(theta)

http://www.wolframalpha.com/input/?i=2%E2%88%973%E2%88%974%E2%88%97cos%CE%B8+