Using MATLAB to find the two limits of SiNx / X and the 1 / x power of (1 + x)

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• 2. How to expand the power function of Ln (1-x) / (1 + x)
• 3. The base area of a cylinder and a cone is equal. The volume of the cone is three times that of the original one, and the height of the cylinder is several times that of the cone
• 4. Cone, sphere, frustum, cylinder, which of these four kinds of geometry is equal to the plane figure seen from above
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• 6. The surface area of a courtyard is 50 square centimeter, and the bottom area is 15 square centimeter. How many square centimeter is the surface area of a large cylinder made up of two such cylinders? Formula
• 7. The radius of the bottom surface of a cylinder is 8cm and the height is 6cm. The cylinder is divided into two parts equally along the diameter of the bottom surface of the cylinder (as shown in the figure). How many square centimeters does the surface area increase from the original?
• 8. There is a cylinder 10 cm high. If its height is reduced by 2 cm, its surface area will be reduced by 18.84 square cm. What is the volume of the original cylinder I need it before 8 o'clock
• 9. The plane at an angle of 30 degrees from the bottom of the cylinder cuts the cylinder to obtain an ellipse and the equation of the circle The radius of the cylinder is 4. The rectangular coordinate system is self built. I can't wait
• 10. If the vertex of the minor axis and the two focal points of the ellipse form an equilateral triangle, then the C / a of the ellipse is equal to?
• 11. Solving differential equations with MATLAB syms a,b,c,d; dsolve('Dy(1)=1/2*a*y(2)*j','Dy(2)=-(c+d)*y(2)*j+1/2*a*y(1)*j+1/2*b*y(3)*j','Dy(3)=-d*y(3)*j+1/2*b*y(2)*j') error(' symbolic:dsolve :errmsg2','There are more ODEs than variables.') Why wrong? Where's the problem,
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• 13. (1 / 2) the distance from a moving point P to a point F (1,0) on a given rectangular coordinate plane is smaller than the distance from it to a straight line x = - 2 (1 / 2) it is known that the distance from the moving point P to the point F (1,0) on the rectangular coordinate plane is smaller than the distance from it to the straight line x = - 2. (1) the trajectory equation of the moving point P is solved. (2) the straight line l passes through the point a (- 1,0) and
• 14. 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______ ．
• 15. It is known that plane a is parallel to plane B, and the distance between them is d. if line L is in plane a, there are several lines converging with line L in plane B to form 2D
• 16. If three planes intersect each other and the three intersecting lines are parallel to each other, the three planes divide the space into two parts______ Part
• 17. Three planes are perpendicular to each other. Their three intersecting lines intersect at a point O. the distances from P to the three planes are 3, 4 and 5 respectively. Then the length of OP is
• 18. On line, etc.: it is known that the line L is parallel to the plane a, and it is proved that the distance from each point on the line to the plane is equal process
• 19. If the difference between the distance from the moving point P (x, y) (Y > 0) to the point F (0,2) in the plane and the distance to the X axis is 2, then the trajectory equation of the moving point P is_______ ．
• 20. The plane equation passing through point (1,2, - 1) and parallel to plane 2x + 3y-z = 0 is