Trig
posted by Courtney .
How do I use the unit circle to evaluate tan(3pi/4)

draw the circle and the line at the given angle. The intersection will give you a point (x,y).
in this case, the line is at an angle of 45 degrees, in QIII, where y=x.
tan (3pi/4) = (1√2)/(1/√2) = 1
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