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The past perfect is used to describe a past action that happened before another past action.It expresses the anteriority of a past action, compared to another past action expressed by the simple past, t...

This is a common question asked by interviewers. It aims to see how you can identify your own weaknesses and how you have tried to overcome them. This is an important skill for medical students and so bei...

Note that we have a constant probability, fixed number of tests, independent patients and only two outcomes, so we can write a binomial distribution X~Bin(4000,0.0005) where X is the random variable repre...

3x+2y=3 x-y=-4 First, we want to cancel out either x or y so that all we have left is the one we haven't cancelled and a number. To do this we can add or subtract the two equations, possibly multipl...

To solve this differential, firstly note that 2cos(x)sin(x) = sin(2x) (by the Double-Angle Sine Identity), this makes computing the differential a lot easier. To differentiate sin(2x) we need to use the c...