SOLUTION: If sin θ = 2 over 7 and tan θ > 0, what is the value of cos θ? I need to show work

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Question 1042537: If sin θ = 2 over 7 and tan θ > 0, what is the value of cos θ?
I need to show work
Answer by ikleyn(52864)   (Show Source): You can put this solution on YOUR website!
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If sin (theta) = 2 over 7 and tan (theta) > 0, what is the value of cos (theta)?
I need to show work
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

You are given  = .


Then  =  =  =  =  =  = .


Since  is positive and  is positive (given !), the angle  is in the first quadrant.


Since  is in QI, the sign at the square root is positive.

Answer.   = .

Solved.


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