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OpenStudy (anonymous):
the terminal side of an angle theta in standard position coincides with the line 2x-y=0 in quadrant 3. find cos theta to the nearest ten-thousandth.
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iYuko (iyuko):
in quadrant 3 both x and y are negative
iYuko (iyuko):
since (x, y) lies on 2x - y = 0==> 2x - y = 0 ==> y = 2x
iYuko (iyuko):
tan(A) = -y/-x = y/x = 2x/x = 2
iYuko (iyuko):
A = tan^-1(2)
iYuko (iyuko):
equals 63.4349
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iYuko (iyuko):
Got it?
OpenStudy (anonymous):
i understand a lot better now. thank you for your help, i really appreciate it n.n
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