Top answers

Maths
A Level

A function is defined parametrically as x = 4 sin(3t), y = 2 cos(3t). Find and simplify d^2 y/dx^2 in terms of t and y.

We first need to find dy/dx and we use the fact that dy/dx = dy/dt * dt/dx. So we have dy/dt = -6sin(3t) and dx/dt = 12cos(3t). Substituing these in we have dy/dx = -6*sin(3t)1/(12cos(3t...

BS
Answered by Barnaby S. Maths tutor
6317 Views

The equation: x^3 - 12x + 6 has two turning points. Use calculus to find the positions and natures of these turning points.

To find the turning points we need to find when the differential of the equations with respect to x is equal to 0. (dy/dx = 3x2 - 12 = 0) From this we find that the turning points happ...

JR
Answered by Jon R. Maths tutor
8233 Views

Differentiating equations of the type ln[f(x)]

To solve such equations we take advantage of log lawes to simplify the problem .

E.g

ln[sqrt(1-x2)] = ln[(1-x2)1/2] = 1/2ln[1-x2]

After sim...

MS
Answered by Mousa S. Maths tutor
3255 Views

How do I integrate x/(x^2 + 3) ?

To solve this you need to integrate by substitution. You can spot this because the differential of the bottom of the fraction is a multiple of the top part, showing this quickly; if u = x + 3...

KM
Answered by Knox M. Maths tutor
11612 Views

integrate by parts the equation dy/dx = (3x-4)(2x^2+5).

The equation we use to integrate by parts is

y = uv - v(du/dx) dx + c

so we separate dy/dx into u=(3x-4) and dv/dx=(2x2+5)

however we still need to find du/dx an...

AH
Answered by Abby H. Maths tutor
6004 Views

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