Convert the rectangular equation to polar form.2x - 9y + 12 = 0
A. 2 cos ? - 9 sin ? = -12
B. 2 cos ? - 9 sin ? = 12
C. r(2 cos ? - 9 sin ?) = -12
D. r(2 sin ? - 9 cos ?) = -12
Answer: C
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