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Question: hi plz help me with this question below for part...

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hi plz help me with this question below for part c and d, make sure show you prove it step by step and explain them, thank you!

Question 5. Given the set A = {r: cos(r) = 0} prove the following: (a) If B = {, 붉붉-5- then B c A. (b) If C {r : sin(z) = 1} then C C A. (c) If D-( + kT, k e Z} then D-A. (Recall, you must show two separate statements: A C D and DC A) (d) If E= {r:cot(r)-1} then En A-0.

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