20pisraelyan 20pisraelyan

23-07-2017
Mathematics

contestada

The law of cosines is a^2+b^2-2abcos(C). Find the value of 2abcos(C).
A. 37
B. -40
C. 40
D. 20

The law of cosines is a2b22abcosC Find the value of 2abcosC A 37 B 40 C 40 D 20 class=

Respuesta :

jdoe0001 jdoe0001

23-07-2017

[tex]\bf \textit{Law of Cosines}\\ \quad \\ c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\\\\ -------------------------------\\\\ \begin{cases} c=2\\ a=4\\ b=5 \end{cases}\implies 2^2=4^2+5^2-(2ab)cos(C) \\\\\\ (2ab)cos(C)=4^2+5^2-2^2[/tex]

and surely you know how much that is.

Answer Link

noriegaevelyn45 noriegaevelyn45

23-12-2020

Answer:

A. 37 i just took the quiz

Answer Link

Otras preguntas

A triangle with angle measures of 45°, 45°, and 90° is an equilateral triangle. True False

The period from 1930 to 1941 saw the formation of the Axis and Allied Powers. On the map, identify the three major Allied countries as of December 1941.

What are the excluded values x+2/y(z-5)

In Ghana the ______ controlled all the trade.

What is the solution to the following system? (2, 3, 4) (4, 3, –2) (4, 3, 2) (6, 7, –2)

One negative effect of assuming differences is _______________. a. we can isolate ourselves from others b. we will experience culture shock c. we will have to l

wich expression represents the phrase one fifth the sum of 14 and a number

Which methods can help prevent wind erosion? Check all that apply. rotating crops mulching soil installing windbreaks growing more vegetation avoiding soil comp

What happened to Stonewall Jackson? A) He was accidently wounded by one of his own soldiers, and days later he died. B) He defeated Lee's troops at the Ba

WHOEVER GETS THE RIGHT ANSWER WILL GET BRAINLIEST ANSWER "Dog Talk." Listen. Do you hear it? No matter where you are, if you stick your head out a window for a