设f(x)=
{1/(2-x),x≤0,
{sinx,x>0,
求∫02f(x-1)dx.
设x-1=t,则dx=dt,x=0时,t=-1;t=2时,t=1,所以 ∫02f(x-1)dx=∫-11f(t)dt=∫-10[1/(2-x)]dx+∫01sinxdx =-ln(2-x)|-10-cosx|01=-(ln2-ln3)-cos1+1 =1-cosl-ln2+ln3.
设f(x)=
{1/(2-x),x≤0,
{sinx,x>0,
求∫02f(x-1)dx.
设x-1=t,则dx=dt,x=0时,t=-1;t=2时,t=1,所以 ∫02f(x-1)dx=∫-11f(t)dt=∫-10[1/(2-x)]dx+∫01sinxdx =-ln(2-x)|-10-cosx|01=-(ln2-ln3)-cos1+1 =1-cosl-ln2+ln3.