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What is the cosine rule and when can it be used?

The cosine rule is used to find the length of a side or size of an angle.

Take a look at the triangle below:

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Answered by Kulvinder L. • Maths tutor

7607 Views

What is homeostasis?

Homeostasis is the maintenance of the internal environment to a constant state, despite changes to the external environment. Examples of conditions in the body which must be kept constant include body...

Answered by George W. • Biology tutor

6833 Views

How do I solve a simultaneous equation?

You will be presented with two equations, both with two unknown values. For example:

8x-2y=19

and

3x=5+y

To begin, we are going to move both unknown terms in ...

Answered by Paul C. • Maths tutor

5873 Views

How do I integrate sin^2(x)?

First, remember the compound angle formula for cosine:

Answered by Christopher D. • Maths tutor

6040 Views

Why is the sky blue?

The colour of the sky comes from sunlight scattering off of the air molecules (and to your eyes). Blue light gets scattered more than red light because it has a shorter wavelength, and so the light yo...

Answered by Alex P. • Physics tutor

9254 Views