sabaahmed900 sabaahmed900
  • 02-10-2020
  • Mathematics
contestada


a
2
=
b
2
+
c
2
−
2
b
c
cos
A
Evaluate
cos
A
given that
a
=
8
,
b
=
6
and
c
=
7
.

Respuesta :

Erlea
Erlea Erlea
  • 02-10-2020

Answer:

a^2=b^2+c^2- 2bc cosA

64= 36+ 49 - 2(6)(7)cos A

64- 85 = 84cos A

84 cosA= -21

cos A= -21/84

cosA= -0.25

Answer Link

Otras preguntas

How essential is the policy to the success of a country? On a government level, how does the policymaking sector work in Pakistan?
ANSERR GIVE ME ANSWERS PLS
standard unit of mass is centimeter​
What are the objectives of community work?
Why would researching the average earnings by major and by career be useful to you as you choose an institute for higher education
Why was Nationalism one of the main causes of World War I? It inspired Germany and Austria-Hungary to join the Triple Entente. It created the desire for self-de
When Machiavelli wrote The Prince in 1513, he faced a lot of criticism. What were the key ideas of The Prince, and how did these ideas influence European rulers
two chemical bonds unite three atoms into a molecule, what type of bonds are they
Explain the impacts of computer in education
Use the drop-down menu to complete the steps for editing a conditional formatting rule. On the ___ tab, click the ___ group. On the Styles drop-down list, clic