Place your graphing calculator in parametric and degree modes. Set the window for Tmin=0, Tmax=360, Tstep=1, Xmin= -1.8, Xmax=1.8, Xscl=1, Ymin= -1.2, Ymax=1.2, Yscl=1. Set the functions to X1T=cos T, Y1T=sin T. Graph the circle of radius 1 on the screen. Use the trace feature to move a short distance around the circle.For what angle T is cos T ? 0.423? (Assume 0° ? T ? 90°.)
A. 65°
B. 0.423°
C. 25°
D. 51.917°
Answer: A
Mathematics
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