SOLUTION: compute the value of cos(t) if its known that sin^2(t) = 1/5 and that the terminal pots of t lies in quadrant 2
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Question 1167597: compute the value of cos(t) if its known that sin^2(t) = 1/5 and that the terminal pots of t lies in quadrant 2
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Pythagorean Identity:
So if \ =\ \frac{1}{5})
then \ =\ \frac{4}{5})
So
\ =\ \pm\sqrt{\frac{4}{5}}\ =\ \pm\frac{2\sqrt{5}}{5})
But 
So
\ =\ -\frac{2\sqrt{5}}{5})
John
My calculator said it, I believe it, that settles it
I > Ø
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