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

Lorenzo de medici was a ___ of the florentine arts
The registration fee for a used car is 0.8% of the sale price of %5,700. how much is the fee?
suggest two ways in which parents can raise boys and girls to encourage equal power relations
write an equation for the line that includes (12,22) and a slope of 4 in standard form
can someone help me 90a÷ -10
Michael, a student, is writing an editorial for the school newspaper to encourage the school to adopt a proposed plan for recycling plastic bottles. What is Mi
What material makes up earth's outer core
Why do we have three branches of government?
What is one way to effectively manage your time? A. Involve others in doing your low-priority tasks. B. Avoid writing down your appointments to reduce the
Your teacher assigns you a research paper on political changes in the United States during the Civil War. Which source would best aid your research