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+// Example 3_3
+clc;funcprot(0);
+// Given data
+P_1=200;// The initial pressure in kPa
+V_1=2;// The initial volume in m^3
+P_2=100;// The final pressure in kPa
+
+// Calculation
+C=P_1*V_1;// The constant
+V_2=(P_1*V_1)/P_2;// The final volume in m^3
+W_12=integrate("C/V",'V',V_1,V_2);// kJ
+printf("\nThe work done by the gas,W_12=%3.0f kJ",W_12);