Every operation has an opposite. With functions the opposite is called the inverse function. It undoes the function and returns you to the initial input.
There is a simple process to follow to find the inverse of any function which we look at in this video.
1) Start by writing the function as y=
2) Switch the x and y's around to get x =
3) Rearrange to make y the subject once more
4) You've found the inverse, so rewrite it as f^-1(x)
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Learn about graphs. In this introductory video we will introduce coordinates, quadrants and the two axis: x-axis and y-axis.
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Let’s discover some more circle theorems so that we can solve all types of geometrical puzzles.
We discovered these 4 theorems in part 1:
Angle at the centre is double the angle at the circumference
The angle in a semi-circle is 90 degrees
Angles in the same segment are equal / Angles subtended by
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If we don't have the vertical height of a triangle, then we can find the area of the triangle using 1/2absinC.
In this video we are going to discover where this formula comes from. The formula is based on area = 1/2 base X height and a