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diff --git a/python/curs/curs7_pyplot_lin_suprafata.py b/python/curs/curs7_pyplot_lin_suprafata.py
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+# -*- coding: utf-8 -*-
+import numpy as np
+import matplotlib.pyplot as plt
+
+# functii 
+
+x = np.linspace(-3, 5,400)
+y = x**2
+x_int = np.array([-1.0,3])
+y_int = x_int**2
+
+plt.plot(x, y, label="$y=x^2$")
+plt.plot(x, 2*x+3, label="y=2x+3")
+plt.scatter(x_int,y_int, s = 60, label="intersecție")
+plt.title("Graficul funției $f(x)=x^2$")
+plt.xlabel("x")
+plt.ylabel("y")
+plt.grid(True)
+plt.axhline(0, color="black", linewidth=0.8)
+plt.axvline(0, color="black", linewidth=0.8)
+plt.legend()
+plt.figure(figsize=(7.2,4.8))
+
+plt.show()
+
+# sin cos
+
+rad = np.linspace(-2*np.pi, 2*np.pi, 100)
+sinus = np.sin(rad)
+cosin = np.cos(rad)
+
+plt.title("Graficele funțiilor sin(x) și cos(x)")
+plt.xlabel("x")
+plt.ylabel("y")
+plt.grid(True)
+plt.axhline(0, color="black", linewidth=0.9)
+plt.axhline(1, color="red")
+plt.axhline(-1, color="red")
+plt.axvline(0, color="black", linewidth=0.5)
+
+plt.plot(rad, sinus, label="$sin(x)$")
+plt.plot(rad, cosin, label="$cos(x)$")
+plt.legend()
+
+plt.show()
+
+# suprafete plane
+
+x = np.linspace(-2, 2, 100)
+y = np.linspace(-2, 2, 100)
+
+X, Y = np.meshgrid(x,y)
+Z = X**2 + Y**2
+
+fig = plt.figure()
+ax = fig.add_subplot(111, projection="3d")
+ax.plot_surface(X,Y,Z, alpha=0.85)
+
+ax.set_title("$f(x,y) = x^2 + y^2$")
+ax.set_xlabel("$x$")
+ax.set_ylabel("$y$")
+ax.set_zlabel("$z$")
+plt.show()
+