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Maths
GCSE
How do I expand (x+a)(x+b)? (plus example)
The key to understanding expanding brackets is to understand that we need to multipy EVERYTHING in the first bracket by EVERYTHING in the second bracket.
We can think of the calculation
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:
Answered by Kulvinder L. • Maths tutor
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