设f(x),g(x)在区间[-a,a](a>0)上连续,g(x)为偶函数,f(x)满足f(x)+f(-x)=A(A为常数).试证.并用该等式计算积分:
问答题设f(x),g(x)在区间[-a,a](a>0)上连续,g(x)为偶函数,f(x)满足f(x)+f(-x)=A(A为常数).试证.并用该等式计算积分:|sinx|arctanexdx.
问答题已知e-x2dx=.求dx.