Respuesta :

mhanifa

Answer:

  • C. Step 6

Step-by-step explanation:

Incorrect step is

  • Step 6

The error is:

  • cos (θ) should be negative as a result of multiplying both sides by - 1

msm555

step 6

Answer:

Solution given:

  1. Cos(2x)=1-2sin²(x)
  2. let 2x=[tex] \theta[/tex]
  3. x=[tex] \theta/2[/tex]
  4. Cos[tex] \theta[/tex]=1-2sin²([tex] \theta/2[/tex])
  5. -1 +Cos [tex] \theta[/tex]=-2Sin²([tex] \theta/2[/tex])
  6. 1-Cos[tex] \theta[/tex]=2sin²[tex] \theta/2[/tex] over here Cos[tex] \theta[/tex] should be positive