(A) Write a program in a script file to solve these three equations using the command (solve). Make your solution for X1, X2, and X3 in terms of X4, -2X1 + 13X2+ 4X 3- 8X 4 = 12 10X1 - 3 X2+ 7X 4 = 31 - Xị + 12X2 -X3-2X4 = 50 (B) Iff= x² + cos(xy), write the commands needed to find: 1) The second derivative of the equation according to x and evaluate the derivative at x = 5. 2) The second integration of the equation according to y and evaluate the integration at y from 0 to 2.

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