(0,0),(9,-7).
x = 0, Y = -7.
r^2 = X^2 + Y^2,
r^2 = 0 + (-7)^2 = 49,
r = 7.
secA = r/X = 7/0 = Infinite.
cotA = X/Y = 0 / -7 = 0.
sinA = Y/r = -7 / 7 = -1.
if (0,-7) lies on the terminal side of angle theta in standard position, find each value sec(theta) , cot(theta) and sin(theta)
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