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The main thing to remember with implicit differentiation is to differentiate each thing as you see it. Don't worry about rearranging the equation until you have differentiated everything first. Say you...

If you know how to multiply fractions, then dividing fractions only involves two more simple steps! 

1. Turn the division sign into a multiplication sign.

2. Flip the last f...

To solve these simulataneous equations we need to use substitution:If 2x + y = 13 then y = 13 - 2xTherefore 3x - y = 12 can be rewritten as 3x - (13 - 2x) = 12We can expa...

If we first calculate 30% of £4 to work out how much the price of the book has been reduced by.10% of £4 is £0.40. We know 30% will be this value multiplied by 3. Therefore 30% of £4 is £1.20.Now that we ...

As this is a right angle triangle, we need to use Pythagoras's Theorem. 

This says that the length of the longest side of a right angle triangle (the hypotenuse) is equal to the sqaure ro...