Use matlab to solve the differential equation and draw the graphic solution Y = solve ('d3y = d2y-dy-y + T ^ 2 ','y (0) = 0','dy (0) = 1 ','d2y (0) = - 1') how to draw a graph after solving this problem!

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• 1. How to draw the image of implicit function x ^ 4 + y ^ 2 = 1 with MATLAB?
• 2. Drawing phase diagram of differential equation with MATLAB dx./dt=y*(4+x^2-y^2) dy./dt=-x(-2-x^2+y^2) Please write the MATLAB phase diagram method of the equation source program!
• 3. Using MATLAB to solve differential equations dx/dt=x-y-x(x^2+y^2) dy/dt=x+y-y(x^2+y^2) x(0)=2 y(0)1
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• 13. If the distance from the moving point P to the point a (0, - 2) on the plane is 2 less than the distance to the L: y line = 4, then the trajectory equation of the moving point P is Detailed process
• 14. The ratio of the distance from the moving point P to the point F (10,0) in the plane to the distance from the straight line x = 4 is 2. The trajectory equation of the point P is obtained
• 15. It is known that the distance from the moving point P to the point F (1,0) in the plane is smaller than the distance from the point P to the line x = - 2. Find the trajectory equation of the point P
• 16. The distance from a moving point P to the point F (2,0) in the plane is 1 less than the distance from it to the straight line x + 3 = 0 The answer is y ^ 2 = 8x (x > = - 3) Why be x
• 17. In the plane rectangular coordinate system, the locus of the moving point m (x, y) whose distance to the point F (0.1) is equal to the distance to the straight line L: y = - 1
• 18. In the plane rectangular coordinate system xoy, it is known that P is the moving point on the image of the function f (x) = ex (x > 0). The tangent l of the image at point P intersects the y-axis at point m, and the vertical line passing through point P intersects the y-axis at point n. suppose the ordinate of the midpoint of line Mn is t, then the maximum value of T is______ ．
• 19. In the plane rectangular coordinate system, the trajectory equation of the moving point m (x, y) whose distance to the point F (0.1) is equal to the distance to the straight line L: y = - 1 is?
• 20. If we know that plane α ‖ plane β, line L ⊂ plane α, point P ∈ line L, and the distance between planes α and β is 8, then the distance to point P in β is 10, and the trajectory of the point with the distance to l of 9 is () A. A circle B. four points C. two straight lines D. two points