# trig

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If θ is an angle in standard position and its terminal side passes through the point (20,-21), find the exact value of sec(θ).

• trig -

so x = 20 , y = -21 , which is in quad IV
r^2= 400+441 = 841
r = √841 = 29

then cos Ø = 20/29
sec Ø = 29/20 = 1.45

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