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Hyperbolic tangent(without Inbuilt)

Y
%hyperbolic tangent function without using inbuilt func
x = -10:0.01:10;
a = input('Enter the slope parameter')
y = (exp(a.*(x))-exp(-a.*(x)))./(exp(a.*(x))+exp(-a.*(x)));
plot(x,y);
xlabel('x')
ylabel('y')
grid on