trig

if sec theta=-5/4 and 180degree < theta< 270degree, find tan theta
a.-3/5
b 4/5
c.3/4
d.3/5

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asked by minh
  1. secθ=-5/4; and θ is in the third quadrant, then
    cosθ=1/secθ=-4/5
    sinθ=sqrt(1-(-4/5)^2)=-3/5 (third quadrant)
    So
    tanθ
    =sinθ / cosθ
    = ?

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    posted by MathMate

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