**Sergeant Soupie:**

What's this dodgy "玉女C经" you're imparting to your godsis?! Got A/B/C-size isit???!

Anyway, sort of expected the Cover-Up Rule to be brought up somewhere in the comments.

But since it is not being taught at all to current O Level students (maybe the powers-that-be simply hate shortcuts), Sergeant Loi has decided not to include it here to prevent any confusion.

For those who are interested in the Cover-Up Rule, check out the workings described in this link - strange that there's no Wikipedia article on this.

It's quick and it's fast and it really works! BUT note that

- it can only be used on
*linear factors* - in the case of
*repeated linear factors*, it can only be used on the one with the**highest power**. - it CANNOT be used on quadratic factors!

* While *most* O Level questions can be solved using the Cover-Up Rule, karma will come and haunt many students who're over-reliant on it when the above conditions appear later in more complex partial fractions in A-Level Maths! Always have your basics to fall back on!

**Bry:** Care to share your 绝世绝招? Or were you referring to the Cover-Up Rule too?