Top answers

Maths
A Level

How do you 'rationalise the denominator'?

There are two approaches to rationalising a denominator depending on how the denominator appears.

First we deal with the simpler case where the surd term is the only term...

Answered by Jacob G. Maths tutor
6893 Views

How do I express y=acosx+bsinx in the form y=Rcos(x-c)?

From the addition formula, we know that:

Rcos(x-c) = Rcos(x)sin(c)+Rsin(x)cos(c)

Therefore:

acos(x)+bsin(x) = Rcos(x)cos(c)+Rsin(x)sin(c)

If we e...

Answered by Daniel R. Maths tutor
24894 Views

How do I find where the stationary points of a function are?

If you were to draw a graph of the function, a stationary point would be a point on the graph where the gradient is zero, i.e the graph has no vertical slope. For example consider the function f(x) = 2. T...

Answered by Laasya S. Maths tutor
12554 Views

How do I differentiate sin^2(x)?

To differentiate this, we must use the Chain Rule. This is because we have two functions multiplied by each other:

(x) sin⁡(x).

We use the substitution u = sin(x)....

Answered by Laasya S. Maths tutor
222317 Views

How to find the equation of a tangent to a curve at a specific point.

The first thing to remember is that the tangent to the curve at a given point has the same gradient as the curve at that point.

Let's consider the general case y=f(x) at a point c=(x1,y1)...

Answered by Rafe L. Maths tutor
8849 Views

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