**Here is a poke to the lovers and non-lovers of Mathematics: You have to enjoy it or it will intimidate you, wink at you, mock you. That said, there is no end to the tasty nostalgia, your dreadful memories notwithstanding.**

So here is a list of concepts that *consumed* all our childhood while trying to decrypt them, only for those silly grades. Boy, don’t we miss these!

**Pythagoras Theorem**

**a ^{2} +b^{2} = c^{2}**

Definition: Pythagoras Theorem states that in any right-angled triangle, the area of the square of hypotenuse side (ages since we wrote the word *hypotenuse*) is equal to the sum of the areas of the squares of the smaller sides (the two sides that meet at a right angle).

Pythagorean was a magic door to solving the most complex problems of geometry, and learning it was apparently no effort. It was the sweetest realization ever when attempting a class test, you realized that the question with highest weightage was the one revolving around Pythagoras theorem.

**Algebra’s X & Y Equations**

**Consider this for a memorabilia:**

**Solution: ** Factor.

(4x +3) (x-2) *= 0*

Using the principle of zero products, which says,

if *ab = 0*, either *a*, *b*, or both must be equal to zero.

4*x+ 3 = 0*, *x – 2 = 0*

*4x = -3* , *x = 2*

*x = (-3/4) or x = -2*

**Don’t the above 8 lines bring back a whole Tsunami of memories? So, how many of you can still get through the question without tripping?**

**Unitary Method**

After warming up with counting from 1 to 100, Unitary Method was our first official date with Mathematics. And I wager, it was a not-so-interesting one. The grumbling apart, Unitary is one of those *few* concepts that still applies to the real, non-geeky world.

**Mode and Mean, Sets**

Now, here was a question in exams we seldom got wrong. Whilst finding medians was a cakewalk, the concept of Mode did require a bit of scratching around.

**Integration and Differentiation**

While df/dx was a no-brainer, _{a}∫^{b} always winked at me in ridicule. The fact that Integration was just a reverse of Differentiation sounded so easier said than done. Integration was endlessly compounding, with one equation leading to another and we never knew when we reached the final level of *union.*

**Permutation and Combination**

Inseparable names like Laurel and Hardy, Permutation and Combination goes about its business at a very lazy speed. No matter how easy you find solving problems with these methods, you would end up quitting mid-way.

Not sure how many second me, but it has been a while since we roamed this knotty territory. The nostalgia, however, refuses to shrug off.

*Authored by Rohit Raina*

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