Question 1072895
 cotangent of theta equals -9/2, find sine of theta 
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cot = x/y
The terminal point is either (-9,2) or (9,-2)
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r = sqrt(x^2+y^2) = sqrt(85)
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sine = y/r = 2/sqrt(85) or -2/sqrt(85)
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my final answer was -1.1981
The sine < -1 --> theta is not a real number.