∫0xJ2⁢n⁡(t)⁢ⅆ⁡t=∫0xJ0⁡(t)⁢ⅆ⁡t-2⁢∑k=0n-1J2⁢k+1⁡(x), ∫0xJ2⁢n+1⁡(t)⁢ⅆ⁡t=1-J0⁡(x)-2⁢∑k=1nJ2⁢k⁡(x),