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

What is the value of x in the equation 7x+2x=18? A) 2 B) 5 C) 9 D) 7
explain why lightning strikes can be dangerous even when an individual is not directly struck.
In which cell is a mutation most likely to affect the next generation?
An object experiences an impulse, moves and attains a momentum of 200 kg·m/s. If its mass is 50 kg, what is its velocity?
Which skin function is not correctly matched with the structure that accounts for that function?which skin function is not correctly matched with the structure
A spring stretches by 21.0 cm when a 135 n object is attached. what is the weight of a fish that would stretch the spring by 49 cm?
The president has many responsibilities, but he or she is just one person. How does he successfully execute all the laws?
When you are hungry, the level of the glucose in your bloodstream is________. after you finish a big meal, the level of the glucose in your bloodstream is _____
Unsafe and unsanitary work conditions in the early 1900s were a problem leading to the development of
for an autobiography, which element of your final draft will you consider to evaluate the richness of your details