1. Evaluate a) for²dr, 2. Evaluate fr+7r² dr. 3. Evaluate a) fe²dr, r/2 4. Find sin rdr. b) dr, c) r²dr, d) for³dr, b) e-zdr, c) ¹₁ r²dr, e) ¹₁ r³dr. d) ¹, 5r³dr.

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