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x = [0.2 0.3 0.7 0.9 1.2 1.3 2.5]

y = (4*cos(2*x)) ./ (5 + sin(3*x)) + 4*exp(-x).*tan(x)

x = [0:0.2:1]'

y = [1:-0.3:2]

x = [0:0.05:4];

y = exp(-3*x).*(6 + sin(4*x));

plot(x,y)

x = [-3:0.005:-0.2];

f = cos(1.7 ./ (x.^3));
g = sin(1 ./ (4*x.^2));

plot(x,f,x,g)

a = [8.5; -3.5; 2.9]
b = [4.3; 0.7; -5.4]

s = sum(a.*b)

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

c = cross(a,b)



a = [4.2; 0; 0]
b = [9.9; 5.5; 0]
c = [-7.8; -3.8; 5.4]

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