1)∫x/x²-4x+5 =? C:1/2[ln|x²-4x+5|]+4arctan(x-2)]+c




2)∫sinx.cosx.cos4x dx=? C:-1/24cos6x+1/8cos2x+c





3)∫cosx-1/sinx dx=? C:2ln(cosx/2)+c

https://img845.imageshack.us/img845/...at24052013.png