initial commit / add all books

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diff --git a/2915/CH5/EX5.5/5_5.JPG b/2915/CH5/EX5.5/5_5.JPG
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diff --git a/2915/CH5/EX5.5/Ex5_5.sce b/2915/CH5/EX5.5/Ex5_5.sce
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+//Example 5.5

+//To determine the period of 2 given cosine functions 

+clear,clc;

+

+//y=cos(3*x)

+multiple = 3; //multiplicity of angle 

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

+required_period = period_cosx / multiple;

+printf('Period of cos(3*x)is %f radians\n',required_period);

+

+//y=cos(0.5*x)

+multiple = 1/2; //multiplicity of angle 

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

+required_period = period_cosx / multiple;

+printf('Period of cos(x/2)is %f radians',required_period);

+

+x = linspace(-0,4*%pi,200);

+y = cos(3*x) ;

+z = cos(x/2) ;

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

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

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

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

+title("Example 5.5","color","blue","fontsize",9);

+legend(["y = cos(3x)";"y = cos(x/2)"]);

diff --git a/2915/CH5/EX5.5/plot5_5.jpeg b/2915/CH5/EX5.5/plot5_5.jpeg
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