initial commit / add all books

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diff --git a/1271/CH13/EX13.8/example13_8.sce b/1271/CH13/EX13.8/example13_8.sce
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+clc 
+// Given that
+x1 = 1 // coordinate on x axis in first case
+y1 = 2 // coordinate on y axis in first case 
+z1 = 3 // coordinate on z axis in first case
+x2 = 1
+y2 = 1
+z2 = 0
+// coordinate of first plane in second case
+x3 = 1
+y3= 1
+z3 = 1
+// coordinate of second plane in second case
+// Sample Problem 8 on page no. 13.27
+printf("\n # PROBLEM 8 # \n")
+printf("Standard formula used \n")
+printf(" d = 1 / (x1^2 + y1^2 + z1^2)^1/2 \n")
+x_=6/x1
+y_=6/y1
+z_=6/z1
+d1 = 1 / sqrt(x2^2 + y2^2 + z2^2)
+d2= 1/ sqrt(x3^2 + y3^2 + z3^2)
+d = d1/d2
+printf("\n The ratio of intercepts of three axes by the point are %d : %d : %d. \n The ratio of  spacing between two planes is %f.",x_,y_,z_,d)
+