YellowRabbit
YellowRabbit YellowRabbit
  • 03-07-2017
  • Mathematics
contestada

Find all solutions to the equation.

7 sin^2x - 14 sin x + 2 = -5

Respuesta :

Floki22
Floki22 Floki22
  • 03-07-2017
7 sin^2x - 14 sinx + 2 = -5

7 sin^2x - 14 sinx = -7

(÷ 7)

sin^2x - 2 sinx = -1

(sinx = y)

y^2 - 2y = -1

y^2 - 2y + 1 = 0

Δ = (-2)² - 4(1)(1)
Δ = 4 - 4 = 0

y' = y'' = (2+0)/2 = 2/2 = 1

sinx = y

sinx = 1

S { π/2 }
Answer Link

Otras preguntas

Alexa needs 20.5 pints of blueberries to jam. She picked 7.75 pints on Friday and pints on Saturday. How many more pints she need to pick?
Which formula can be used to describe the sequence? f(x) = 1.2(2.5)x – 1 f(x) = 2.5(1.2)x – 1 f(x) = 1.2(2.5)x f(x) = 2.5(1.2)x
2 1/2 grains to gram
What social behaviors are part of any society's economic system? How do anthropologists view economic systems? PLEASE HELP, WILL MARK BRAINLYIST!
the diagram shows a logo
Two negative reviews and no positive reviews is enough to consider the website to have a negative reputation.
what is a significant personal cost associated with the flu
It.........(rain) cats and dogs here is the monsoon season.​
I need to make sure I do this right
I need to make sure I do this right