Y = sinh(X) returns the hyperbolic sine
of the elements of X. The sinh function
operates element-wise on arrays. The function accepts both real and complex inputs.
All angles are in radians.

The hyperbolic sine satisfies the identity $\mathrm{sinh}\left(\mathit{x}\right)=\frac{{\mathit{e}}^{\mathit{x}}-{\mathit{e}}^{-\mathit{x}}}{2}$. In other words, $\mathrm{sinh}\left(\mathit{x}\right)$ is half the difference of the functions ${\mathit{e}}^{\mathit{x}}$ and ${\mathit{e}}^{-\mathit{x}}$. Verify this by plotting the functions.

Create a vector of values between -3 and 3 with a step of 0.25. Calculate and plot the values of sinh(x), exp(x), and exp(-x). As expected, the sinh curve is positive where exp(x) is large, and negative where exp(-x) is large.

x = -3:0.25:3;
y1 = sinh(x);
y2 = exp(x);
y3 = exp(-x);
plot(x,y1,x,y2,x,y3)
grid on
legend('sinh(x)','exp(x)','exp(-x)','Location','bestoutside')

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