${\displaystyle \underset{0}{\overset{1}{}}}{\displaystyle \underset{0}{\overset{x^2}{}}}{\displaystyle \underset{0}{\overset{x+y}{}}}f(x,y,z)dzdydx$

Calculate the integral value $of$ the function $f(x,y,z)=e^x(y+z)(2siny+cosz)$

by using trapezoidal method and number of intervals n$=30.$ Please use C programming basic level.