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Maths
A Level

What does it mean when I get a negative value when I do a definite integral?

The definite integral gives the value of the area bounded between the curve at the given limits, and the x-axis (if we are integrating with respect to x!) If this value is negative, it means that the area...

CL
Answered by Callum L. Maths tutor
12851 Views

Differentiate y=x^2cos(x)

using the product rule

product rule is dy/dx=v.du/dx+u.dv/dx

let u = x^2 and v = cos(x)

du/dx=2x

dv/dx = -sin(x)

so dy/dx=2xcos(x)-x^2sin(x)

EM
Answered by Ellen M. Maths tutor
6135 Views

The point A lies on the curve with equation y = x^(1/2). The tangent to this curve at A is parallel to the line 3y-2x=1. Find an equation of this tangent at A. (PP JUNE 2015 AQA)  

My exact explanation would depend on the students level of understanding. The following answer assumes a basic understanding of differentiation and equations of lines; a) Gradient of tangent is equal to g...

SC
Answered by Sefret C. Maths tutor
6928 Views

How do you differentiate x^x?

To differentiate xx, we first let y = xx. (Note that xx is not in the form xc w...

AP
Answered by Anish P. Maths tutor
2970 Views

The straight line with equation y = 3x – 7 does not cross or touch the curve with equation y = 2px^2 – 6px + 4p, where p is a constant. Show that 4p^2 – 20p + 9 < 0.

The main piece of information this question gives us is that the two lines do not cross or touch. From this we can immediately see that we will need to use the discriminant of the quadratic formula b...

MW
Answered by Molly W. Maths tutor
25414 Views

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