Top answers

Work out the value of: 2+8x3

When it comes to equations that have more than one symbol, you must always follow BODMAS: Brackets, Order, Division, Multiplication, Addition, Subtraction. The equation we have is 2 + 8 x 3, using BODMAS we ...
MU
Answered by Melanie U. • Maths tutor
5045 Views

Prove that 1/sin(2theta) - cos(2theta)/sin(2theta) = tan(theta)

Before we begin to approach this question, we first write down all the relevant formulae for this trigonometry question. We can see that we will need the double angle formulae (on account of the presence of ...
CM
Answered by Colin M. • Maths tutor
22601 Views

What is dy/dx when y=ln(6x)?

This is a common question on A2 Maths papers as it tests both the ability to use the chain rule and the ability to differentiate natural logarithms. y = ln(6x) Alarm bells should start ringing whenever a que...
EM
Answered by Eleanor M. • Maths tutor
13918 Views

Using mathematical induction, prove De Moivre's Theorem.

De Moivre's theorem states that (cosø + isinø) n = cos(nø) + isin(nø). Assuming n = 1 (cosø + isinø) 1 = cos(1ø) + isin(1ø) which is true so correct for n = 1 Assume n = k is true so (cosø + isinø) k = cos(k...
SE
Answered by Scott E. • Maths tutor
83302 Views

Solve for y: 5(y – 2) + 2(y – 3) = 19

Most important thing is to do the same thing to both sides of the equation. 5(y – 2) + 2(y – 3) = 19 Step 1. Multiply out the brackets: 5y - 10 + 2y - 6 = 19 Step 2. Collect like terms & Simplify: 5y + 2...
RJ
Answered by Rahul J. • Maths tutor
11075 Views