12g(t+t1)2\frac{1}{2} g\left(t+t_{1}\right)^{2}21g(t+t1)2
12g(t2+t12)\frac{1}{2} g\left(t^{2}+t_{1}^{2}\right)21g(t2+t12)
18g(t2+t12)\frac{1}{8} g\left(t^{2}+t_{1}^{2}\right)81g(t2+t12)
18g(t+t1)2\frac{1}{8} g\left(t+t_{1}\right)^{2}81g(t+t1)2