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Maths
A Level

What is the gradient of y = xcos(x) at x=0?

First we want to calculate the derivative of y. To do this we use the product rule:If we rewrite y as y = uv, then dy/dx = vdu/dx + udv/dx.Here, we have u = x and v = cos(x).That means du/dx = 1 ...

FF
Answered by Fraser F. Maths tutor
4257 Views

Find the integral of sin^2(X)

As soon as you see a question asking you to integrate the square of sin, cos or tan, your first approach should be to use trigonometric identities and double angle formulas

KF
Answered by Kyna F. Maths tutor
436452 Views

Showing all your working, evaluate ∫ (21x^6 - e^2x- (1/x) +6)dx

When integrating a long chain of functions, we can integrate each term seperately and combine them. Let us now integrate:∫21x6dx = 21∫x6dx. Using the Power Rule [∫xadx = (...

RA
Answered by Raghav A. Maths tutor
6664 Views

Differentiate y=x(e^x)

Write as y=uv u=x v=ex

du/dx=1 dv/dx=ex 

Using the product rule, dy/dx=vdu/dx + udv/dx

So dy/dx=ex(1)+x(ex...

IR
Answered by Isabel R. Maths tutor
4462 Views

Solve the equation 3^(5x-2)=4^(6-x), and show that the solution can be written in the form log10(a)/log10(b).

So we have the equation initially in the form 3^(5x-2)=4^(6-x), and as the solution involves log10, then  a sensible first move would be to take log10 of both sides, giving log10(3^(5x-2)) = log10(4^(6...

EB
Answered by Eloise B. Maths tutor
5813 Views

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