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| Expert | Average Ratings | Expertise |
|---|---|---|
Ahmed SalamiNigeria
Available
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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. | |
ScottoU.S.
Available
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Any kind of mathematics (calculus, analysis, game theory, linear approximation, finite differences, linear regression, linear programming, numerical analysis, probability, statistics, etc.). I also have answered some questions in Physics (mass, momentum, falling bodies), Chemistry (charge, reactions, symbols, molecules), and Biology. | |
Paul KlarreichAvailable
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All topics in first-year calculus including infinite series, max-min and related rate problems. Also trigonometry and complex numbers, theory of equations, exponential and logarithmic functions. I can also try (but not guarantee) to answer questions on Analysis -- sequences, limits, continuity. | |
Alon MandesIsrael
Available
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Kind of questions I can answer : Limits, Derivatives, Integration, Implicit functions, continuousity, differentiation ,Extremum problems, Lagrange multipliers, Gradients, Surface integrals, Multi variables functions ,Multi variables Integrals,Complex variables ,Complex functions, Curves, Trajectory integrals & Vector analyse,Divergence,Rotor & word problems. Kind of question I can't answer : Economics,Combinatorics,infinite series & convergence ,Statistics & Probabilities . | |
SocratesOn Vacation
returns 11/29/2009 |
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. |
f(x)=x^4-6x^2+2 f'(x)=4x^3-12x f'(x)=0 : 4x^3-12x=0 --> x(4x^2-12)=0 . Solutions : x1=0, x2=√3, x3=-√3 . These are the critical points . f''(x)=12x^2-12 . f''(0)=-12 --> -12<0 then x1=0
Questioner: Terry Country: Canada Category: Calculus Private: No Subject: calculus, maximizing revenue Question: Demand for a good is given by P=100*e^(0.00125X) ($p/unit, x units/month)
Is that supposed to be f(x) = 2x/(x²+1)? The derivative f'(x) = ((x²+1)2 - 2x*2x)/(x²+1)². That simplifies to f(x) = 2/(x²+1)². The denominator is always positive, so there is 0, so there is no maximum
Questioner: Vickkie Country: United States Category: Calculus Private: Yes Subject: Help Derivatives Question: Please help me find the intervals of f(x) increasing, the interval of f(x) decreasing
When x is in radiands, the answer is 1. This is because the Taylor's expansion of sin(x) = x - x^3/3! + x^5/5! - x^7/7! .... Divide by x, and all the terms have an x left in them except for the first

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