here t varies from -pi to pi x is a constant like for example 0.1
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x = 0.1; t = linspace(-pi, pi, 200); p = 0.5 * (1 - x.^2) ./ ((1 + x.^2 - 2 .* x .* cos(t)).^(3/2)); plot(t, p);
Such methdos are explained exhaustively in the Getting Started chapters of the documentation and help plot offer detailed information also.