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x = [0.1 0.4 0.6 0.7 1.1 1.5 2.3]

y = cos(x).^2 ./ (1 + sin(x)) - exp(-x).*log(x)

x = [0:0.3:1]'

y = [2:-0.2:1]

x = [0:0.05:5];

y = exp(x).*cos(5*x);

plot(x,y)

x = [-1:0.005:-0.3];

f = cos(x.^-2);
g = cos(1.5*x.^-2);

plot(x,f,x,g)

a = [1.5; -4.8; 0.9]
b = [6.3; 9.7; -1.4]

s = sum(a.*b)

d = sqrt(sum(a.*a))

c = cross(a,b)

a = [2.5; 0; 0]
b = [0.3; 3.2; 0]
c = [-0.3; -2.1; 4.2]

v = abs(sum(a.*cross(b,c)))