initial commit / add all books

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diff --git a/2915/CH1/EX1.5/Ex1_5.sce b/2915/CH1/EX1.5/Ex1_5.sce
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+clc,clear

+//example 1.5

+//To find values of all trigonometric functions for angles A and B

+

+//Angle at vertex A

+opposite = 3;

+adjacent = 4;

+hypotenuse=5;

+

+sin_A = opposite / hypotenuse;

+cos_A = adjacent / hypotenuse;

+tan_A = opposite / adjacent;

+csc_A = hypotenuse/opposite;

+sec_A = hypotenuse/adjacent;

+cot_A = adjacent / opposite;

+printf('ANGLE A')

+printf('\nsin(A)=  %.1f   ; cos(A)= %.2f;   tan(A)= %.2f;\n',sin_A,cos_A,tan_A)

+printf('csc(A)=  %.3f ; sec(A)= %.2f;   cot(A)= %.2f;',csc_A,sec_A,cot_A)

+

+//Angle at vertex B

+opposite = 4;

+adjacent = 3;

+hypotenuse=5;

+

+sin_B = opposite / hypotenuse;

+cos_B = adjacent / hypotenuse;

+tan_B = opposite / adjacent;

+csc_B = hypotenuse/opposite;

+sec_B = hypotenuse/adjacent;

+cot_B = adjacent / opposite;

+printf('\n\nANGLE B')

+printf('\nsin(B)=  %.1f   ; cos(B)= %.2f;   tan(B)= %.2f;\n',sin_B,cos_B,tan_B)

+printf('csc(B)=  %.2f  ; sec(B)= %.2f;   cot(B)= %.2f;',csc_B,sec_B,cot_B)