3 Consider the following Heun s method wo a w 1 w hf t w 3hf t 2 h w hf t 3 w hf t w a Write Heun s method in the general form of Runge Kutta method using updates k k2 k3 i e the format we use for RK4 in lecture 5 b Write down the Butcher Tableau for Heun s method c Show Heun s method is consistent and stable