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For English, it is key to not get overwhelmed with memorising poems or passages from the texts that you're studying. Make sure you have read through any texts that you are covering at least twice and anno...

So we know that 3/5 teachers in the school are female, and we also know that 36 teachers are male. 

The first thing to note is that if 3/5 are female, that leaves 2/5 to be male. This is because al...

In general, the imperfect tense is used to describe uncompleted actions whereas the perfect tense is applied when an action is complete. 

1. The imperfect explains what happened with no referenc...

Receptors are specialised cells used to detect, stimuli or even convert stimulus in to an impulse. They are usually found in sense organs like the eye, which has light sensitive receptors known as retina,...

let sin(x)=u , let cos(x)=v

du/dx = cos(x),   dv/dx = -sin(x)

d[sin(x)cos(x)]/dx = v.du/dx + u.dv/dx

= cos^2(x) - sin^2(x)