A tricky maths question from a recent GCSE exam has left adults on social media rejoicing that they're no longer at school as they had 'no idea' how to work out the answer ...

During the fractional distillation of crude oil: ...

Some exact trigonometric values are equivalent. For example, \( \frac{1}{√2}\) = \( \frac{√2}{2}\). The denominator has been rationalised. To be successful with exact trigonometric values, especially ...