Top answers

Differentiate the equation y = (1+x^2)^3 with respect to (w.r.t.) x using the chain rule. (Find dy/dx)

For this example it would be better to use a dummy variable (a variable just to help with solving the equation but isn't a part of the final answer). Let us say our dummy variable, t = 1+x^2. So, substitutin...
PA
Answered by Paolo A. • Maths tutor
6491 Views

How does the right angle triangle definition of sine, cosine and tangent relate to their graphs as a function of angle and to Euler's formula?

To answer this question we must understand the representation of the unit circle firstly in real coordinates and secondly in the complex plane. The unit circle is just the drawing of a circle of radius 1 in ...
CD
Answered by Caroline D. • Maths tutor
3985 Views

Describe and explain two ways in which alveoli in the mammalian lung are adapted for efficient gaseous exchange

Alveoli in the mammalian lung are thin walled to allow the quick passage of gases, for example oxygen and carbon dioxide. Alveoli in the mammalian lung have a large surface area which allows for the diffusio...
GA
Answered by Guy A. • Biology tutor
3537 Views

Integrate the expression cos^2(x).

This is a common question in C4 and the trick used to solve it is often used in sub-sections to full questions. To solve it, we must simplify the expression in terms of cos(2x) using two trigonometric identi...
RT
Answered by Rohan T. • Maths tutor
6126 Views

In 'Do Not Go Gentle Into That Good Night', how does the poet present the speaker's feelings about his father?

Dylan Thomas’s poem is concerned with the rush of emotions his speaker encounters upon the realisation of his father’s imminent death. Indeed, it is from this liminal space – between life and death – that th...
WA
17464 Views