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

A boat travels 12 km upstream and 40 km downstream in 8 hours. It can go 16 km upstream and 32 km downstream in the same time. Find the speed of the boat in sti
write down any six impacts of uncontrolled migration on economic​
Highlight five ways in which social media influence modern parenting​
Why do large jet airplanes fly in the stratosphere? Please give a proper answer. Will mark brainliest.
Chọn dạng đúng của động từ trong ngoặc Many people like to be _ and rich (fame)
HELP ASAP ILL GIVE BRAINLIST The probability of a red candy being selected from a bowl is 0.9, and the probability of a pink frosted animal cookie being taken o
the ratio of thomson's age to racheal's age is 2:3.racheal is 24 years old. how old is thomson?
The probability that a patient recovers from a disease is 0.3.If 6 people are known to have contacted the disease, what is the probability that at least 4 survi
Good morning Mr. , i would like to know how to get job for student online or online job for student
All of the following statements are true, except for which? A. LIZM B. FG = JK C. ZJE ZF D. LMHG