Review the proof of Cosine (StartFraction theta Over 2 EndFraction) = plus-or-minus StartRoot StartFraction 1 + cosine theta Over 2 EndFraction EndRoot. Which step contains an error?

Error in step (5)

Step-by-step explanation:

Steps                             Statements

    1                            cos(2x) = 2cosx - 1

    2                           Let (2x) = θ

    3                           Then x =

    4                           cos(θ) =

    5                           cos(θ) + 1 =

    6                            

    7                            

    8                            

By comparing the solution given in the picture attached with the solution above,

Step 5 has error.

There should be [cos(θ) + 1 = ] in place of [-1 + cos(θ) = ]

24

step-by-step explanation:

i assuming that 2 sides are 6 the other 2 sides are 4 cm so 6 times 4 is 24 : )

7

step-by-step explanation: