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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.
An engineering graduate. I have been doing maths and physics all my life.
| User | Date | K | C | T | P | Comments |
|---|---|---|---|---|---|---|
| Taylor | 11/04/09 | 10 | 10 | 10 | 10 | |
| Thomas Allen | 11/03/09 | 10 | 10 | 10 | 10 | After I sat and typed it out ..... |
| shahbaz | 11/02/09 | 10 | 10 | 10 | 10 | Thank u so much |
| Chenne | 11/01/09 | 10 | 10 | 10 | 10 | |
| vsikandari | 11/01/09 | 10 | 10 | 10 | 10 | thanks |
Hi Kevin, Let the height of the ladder on the wall at any time be y, and the distance to the foot of the ladder be x. We know that x² + y² = 20² = 400 Differentiating with respect to x,
Hi Chenne, y = 3arccos(x/2) dy/dx = 3.(1/2).-1/√[1 - (x/2)²] = -3 / 2√(1 - x²/4) at x = 1 dy/dx = -3 / 2√(1 - 1/4) = -3 / 2√(3/4) = -3 / √3
Hi Vsikandari, f(x) = a-x/a+x Let f(x) be y and its inverse z y = a-x/a+x y(a+x) = a-x ay + xy = a - x xy + x = a - ay x(y+1) = a(1-y) x = a(1-y)/(y+1) And so, the inverse of f(x) z = a(1-x)/(x+1)
Hi John, f(x) = ax³ + 3x² + bx f'(x) = 3ax² + 6x + b f''(x) = 6ax + 6 If x = 1 is a point of inflection, then f''(1) = 0, i.e 6a(1) + 6 = 0 a = -1 A local minimum occurs when f'(x) = 0, i.e 3ax²
Hi Tyler, let the square base have sides with length x and the height be h. The base area = x² The box has four other sides with area xh and so the total area = 4xh The total cost of the base is then

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