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How do I write an A* grade essay?

The key to writing a successful essay at A-level & GCSE is to always have the Assessment Objectives in your head (it might even help to write them down as part of your plan). It is a common complaint tha...
JT
9866 Views

A Curve has parametric equation x=2sin(t), y= 1+cos(2t), -pi/2<=t<=pi/2. a) Find dy/dx when t=pi/3. b) Find the Cartesian equation for the curve in form y=f(x), -k<=x<=k. c) Find the range of f(x)

x=2sin(t), y=1+cos(2t) a) By chain rule, dy/dx = (dy/dt)/(dx/dt) dy/dt = -2sin(2t), dx/dt= 2cos(t) dy/dx= -sin(2t)/cos(t) dy/dx=-2sin(t)cos(t)/cos(t) dy/dx=-2sin(t) when t = pi/3, dy/dx= -sqrt(3) b) dy/dx = ...
MB
Answered by Max B. • Maths tutor
11504 Views

Find the first and second derivatives of: y = 6 - 3x -4x^-3, and find the x coordinates of the line's turning points

dy/dx = -3 +12x^-4 d^2y/dx^2 = -48x^-5
MS
Answered by Matthew S. • Maths tutor
3992 Views

Discuss the causes and associated health problems of atherosclerosis

Causes- Too much cholesterol in the blood. This can be as a result of high LDL and low HDL levels in the blood. or as it is more known as a high LDL:HDL ratio. LDL are not very good for you and a way to reme...
LK
3699 Views

What is £23 increased by 4%?

There are two steps to solving this problem. First, we want to find out how much the increase itself is, so we want to calculate 4% of £23. Then, we want to add the result to the £23. That will give us the f...
GB
Answered by Giulia B. • Maths tutor
5642 Views