Identify a technique of integration for evaluating the integral. If necessary, explain how to first simplify the integrand before applying the suggested technique of integration. You do not need to evaluate the integral.
A. Integrate by parts with u = 1-cot x, dv = csc2x dx
B. Integrate by parts with u = csc2x, dv = (1 - cot x) dx
C. Substitute, letting u = 1-cot x
D. Substitute, letting u = csc2x
Answer: C
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