QUESTION 5. Show that if 0 ≤r≤n, then r+2 r r (c) + (+³) + (+³) +- + (*) -(+) n n+ = r (1)...using induction on n. (2) ...using a combinatorial proof.

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A: Steps and explanations are as follows:In case of any doubt, please let me know. Thank you.

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A: Solution:

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A: Steps and explanations are as follows:In case of any doubt, please let me know. Thank you.

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Q: 1) Find all complex solutions to cos(z) =

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Q: 2) Find the general solution to the differential equation d²x dt² 2 dax = dt

A: Step 1: