initial commit / add all books

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diff --git a/2915/CH5/EX5.4/Ex5_4.sce b/2915/CH5/EX5.4/Ex5_4.sce
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+//Example 5.4

+//To determine the period of given sinusoidal function 

+clear,clc;

+

+multiple = 2; //multiplicity of angle 

+period_sinx = 2*%pi ;//period of sin(x) in radians

+required_period = period_sinx / multiple;

+printf('Required period is %f radians',required_period);

+

+//Note that sin 2x “goes twice as fast” as sin x.

+//While sin x takes a full 2*pi radians to go through an entire cycle

+//sin 2x goes through an entire cycle in just pi radians

+

+x = linspace(-0,2*%pi,100);

+y = sin(2*x) ;

+z = sin(x) ;

+set(gca(),"grid",[4 4]);

+plot(x,y,'r-');

+plot(x,z,'b-');

+xlabel("$0\le x\le 2*pi$","fontsize",4,"color","red");

+ylabel("$y(x)=sin(2x)$","fontsize",4,"color","red");

+title("Example 5.4","color","blue","fontsize",9);

+legend(["sin(2x)";"sin(x)"]);

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