Solve step by step the integral

N 1) (ti- t' j + 3t' k) do OSHO 4 2t 2) J+ k dt 1+ + 1+t 71 12 3) (3 sen t costi+3 sent cost j+ 2 sent cost k) dt 04) [ Pittvt -1 j+t sennt k)dt 1 5) site " it k dt 1 -t V1-t