1.input the formula in matlab or math studio(mobile app),and plot it
2.search (sqrt(cos(x))*cos(200x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(9-x^2), -sqrt(9-x^2) from -4.5 to 4.5 in google,and you will see the following graph
3.Draw heart in Mathematica,
17 x^2 - 16|x|y + 17 y^2 < 225
17 x^2 - 16|x|y + 17 y^2 + 150/|5 x + sin(5 y)| < 225
4.3D heart
a.
（x^2 + (9/4)y^2 + z^2 - 1)^3 - x^2z^3 - (9/80)y^2z^3 = 0
b.Draw the graph of (2x^2+y^2+z^2-1)^3-(x^2z^3)/10-y^2z^3=0 in Mathematica,
