Let cos A = with A in QI and find sin(2A)

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  sin(2A) = 0.6

Step-by-step explanation:

A couple of trig identities are involved:

  sin(α) = √(1 -cos(α)²)

  sin(2α) = 2sin(α)cos(α)

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First, we need to find sin(A):

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Alternate solution

Your calculator can also find this for you:

  sin(2A) = sin(2·arccos(1/√10)) = 0.6

the answer to the question is a  

it has the same slope and the same y-intercept.

i think asking google will you get the answer to that question