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+clc
+// initialization of variables
+clear
+tau_xx= -1 // kgf/cm^2
+tau_yy= 0 // kgf/cm^2
+tau_xy= 7 // kgf/cm^2
+// calculations
+sigma_1=(tau_xx+tau_yy)/2+sqrt((1/2*(tau_xx-tau_yy))^2+tau_xy^2)
+sigma_2=(tau_xx+tau_yy)/2-sqrt((1/2*(tau_xx-tau_yy))^2+tau_xy^2)
+x=sigma_1 // positive one is tension
+if(sigma_2>sigma_1)
+ x=sigma_2
+end
+// Results
+printf('The diagonal tension is %.3f kgf/cm^2',x)