sentence1: How do I integrate -LSB- math -RSB- \ dfrac -LCB- 1 + x -RCB- -LCB- x ^ 2 + 3x + 1 -RCB- \ mathrm -LCB- d -RCB- x -LSB- / math -RSB- ?
sentence2: How can I integrate -LSB- math -RSB- \ frac -LCB- \ log x -RCB- -LCB- \ sqrt -LCB- 1-x ^ 2 -RCB- -RCB- -LSB- / math -RSB- ?