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This isn't a trick so much as a way to let you show you can think for yourself. You might be thrown off initially if a quadratic equation is in a format that you don't recognise, but usually all it takes ...
To work out how many litres of white and blue paint is needed, use the ratio 3:2. To find the specifc ratio for 18 litres, of paint: 2+3=5, 18/5=3.6 so (3:2)3.6 becomes 10.8:7.2 (check 10.8+7.2=18). S...
First let a = b = x such that:
cos(a + b) = cos(a)cos(b) - sin(a)sin(b)
becomes:
cos(x + x) = cos(x)cos(x) - sin(x)sin(x)
Leading to:
...
Note that this property is the definition of an odd function, or draw a sketch of what this looks like in general about the horizontal axis. E.g. f(x)=sin(x) which has the expansion f(x)=x-((x^3)/3!)+((x^...
To tackle this question, start by expanding the brackets: 12x + 4y = 12 - 2y Making x the subject of the equation requires x to be on its own. So, in this example, we need to first get ...
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