Question: 1 = 3 0 , 2 = 1 + 4 5 , 3 = 1 + 9 0 1 = 7 5 0 , 2

1=30,2=1+45,3=1+90
1=750,2=200,3=-500
1=(+yy2)+(-yy2)cos(21)+xysin(21)
2=(+yy2)+(-yy2)cos(22)+xysin(22)
3=(+yy2)+(-yy2)cos(23)+xysin(23)
p=(+yy2)+-(-yy2)2+(xy)22
Use Excel to find both 2D principal strains

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