[R] help me

Hello, I am a student and I working with R. I want to ask you how to solve this integral which is shown in image attach with this letter. And how to draw this function z = 4 – x2 – y2 , width intervals x = ±1, y = ±1. Thank You. Yours sincerely, Jolanta

[R] help me

Hello, Can You help me? How to save this functions in cd: install.packages("Ryacas", dep = TRUE) library(Ryacas) yacasInstall() yacas("Integrate(z,1,2-x-y)1") yacas("Integrate(y,0,1-x)2 - x - y - 1") yacas("Integrate(x,0,1)(1 - x)^2 - (1 - x)^2/2") Thanks You, Sincerely, Jolka _