Recent content by mercedesbenz

please help me, I try to do but i can not. 1. Find a vector function F(t) whose graph is the curve of intersection of z=\sqrt{4-x^2-y^2} and y=x^2. 2. Find parametric equations for the line that is tangent to the curve r(t)=(e^t)i+(sin t)j+\ln(1-t)k at t=0. 3. Find the point on the...

Homework Statement 1. please help me find the distance from the point (0, 0 ,0) to the line x=4-t, y=3+2t, z=-5+3t (-\nfty<t<\infty) 2. find the distance between the point (3, 1, -2) and the plane x+2y-2z=4 3 find the principle unit notmal N, the curvature , and the radius of curvature...

I'm so sorry,I understand what you mean, Ok,

Homework Statement help me find \frac{PS}{AR} Homework Equations 3. The Attempt at a Solution [/B]

Homework Statement please help me find maximum area of ABCD

Thank you so much I've already solved it.

[SOLVED] please hint me Homework Statement 28. What is the coefficient of x^{88} from (x+1)(x+2)(x-3)(x+4)(x+5)(x-6)...(x+88)(x+89)(x-90). 29. Find x from this equation \frac{108}{\sqrt{x^2-2916}}=\frac{378-x-\sqrt{x^2-2916}}{x+54}. Homework Equations The Attempt at a Solution

Please help me find examples. u_n\subset [0,\infty) and v_n\subset [0,\infty) such that u_{n+1}\leq u_n+v_n for all n and \sum_{n=1}^{\infty}v_n is finite. In fact, this is a theorem which say that u_n\subset [0,\infty) and v_n\subset [0,\infty) such that u_{n+1}\leq u_n+v_n for...

I want to find v_n\neq 0 ,u_n\neq 0 for all n

Homework Statement Please help me find examples. u_n\subset [0,\infty) and v_n\subset [0,\infty) such that u_{n+1}\leq u_n+v_n for all n and \sum_{n=1}^{\infty}v_n is finite. Homework Equations The Attempt at a Solution

thank you so much for your advice,VietDao29.I will try to do it again.

Thank you so much,HallsofIvy. In my first post. you know, this is my ploblem which I've tried to do it for 1 month. Thank you again.

Let u_n be a sequence of positive real number. If \sum_{n=1}^{\infty}u_n^{2} finite + (condition??) then \sum_{n=1}^{\infty}u_n finite. I want to find the condition.Please help me.

Let u_n be a sequence of positive real number. If \sum_{n=1}^{\infty}u_n^{2} finite + (condition??) then \sum_{n=1}^{\infty}u_n finite. I want to find the condition.Please help me.