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Abe Mantell

Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!

Ahmed Salami

I can provide good answers to questions dealing in almost all of mathematics especially from A`Level downwards. I believe i would be very helpful in calculus and can as well help a good deal in Physics with most emphasis directed towards mechanics.


Any kind of calculus question you want. I also have answered some questions in Physics (mass, momentum, falling bodies), Chemistry (charge, reactions, symbols, molecules), and Biology (reproduction, insusion of chemicals into bloodstream).


I can answer questions from the standard four semester Calculus sequence. I am not prepared for questions on Tensor Calculus. Everything else is welcome. Derivatives, partial derivatives, ordinary differential equations, single and multiple integrals, change of variable, vector integration (Green`s Theorem, Stokes, and Gauss) and applications.

Frederick Koh

I can answer questions concerning calculus, complex numbers, vectors, statistics , algebra and trigonometry for the O level, A level and 1st/2nd year college math/engineering student.

Recent Answers

2017-03-19 choosing a suitable substitution for the integral of 1/(x^2+x+1):

Hi,      You are on the right solution pathway, the integral subsequently gets reduced to an arctan function.    Here is the general formula:    <u>integrating f'(x)/{[f(x)]^2 +a ^2 } wrt x gives 1/a *

2017-03-17 Extrema, Rolle's and Mean Value Theorem:

A) The global or absolute maximum is the highest point the graph reaches in the y direction.    B) The global or absolute minimum is the lowest point the graph reaches in the y direction.    C) The global

2017-03-12 Simple Harmonic Motion:

It could be, for a 2-dimensional the surface of a drum or some other flexible surface that can oscillate.  The usual example students see is in a first course in differential equations..

2017-02-27 Calculus:

To start the problem off, I read the questions.  We need to find f(5), g(g), f(5), and g(f).  They are f(4)=6, f(5)=6, g(5)=4, f(5)=0, and g(5) = (5-3)/(7-3) = 2/4 = 1/2.  Note that g(5)=4=16.  

2017-02-22 Calculus 2:

Hello Victoria,    1. Perform each integral, then solve for b in terms of a.  .  The left side becomes e^b-1, the right side is 2(e^a-1), but they  .  are equal.  Thus, e^b-1=2(e^a-1) solve for b

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