21.

Evaluate the given integral 3 points -3 dx 2x + 1 -3In V2x + 3/+ c In -3\\2x + 3|+ C OM OH - In V2x + 1 + c None of the above OP Oo In + C V2x + 1 OKEvaluate 3 points 3y-3 dy 3 None of the above OP OH 2v6 +c + C 4 14 OM Oo 3 +c OKEvaluate 3 points 1 1 cot 2x dx sin- 2x 1 1 cot 2x 1 1 cot 2x + C In 11 + C In 121 OM OK 1 1 cot 2x 1 1 cot 2x + C In 2 + C In 211 Oo OP none of the above OHEvaluate 3 points (xx + 2) dx None of the above In (xx + 2)2 + c OK OM In (xx + 2) 2* + C (xx + 2)2 + C OH OP 2 (xx + 2)2 + C Oo