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Maths jokes on a maths site are always a good thing   

Hi Max,

Did you trigger the automated off topic by putting [fun] in square brackets ?

\(\text{Your answer is:}\sqrt{1-(\frac{1}a)^2}\\ \text{But the answer is:}\frac{\sqrt{a^2-1}}{a}\)

\(\sin\theta = \frac{1}{a}\\\text{Opposite side of }\theta = 1\\\text{Hypotenuse}=a \\\therefore \text{Adjacent side of }\theta = \sqrt{a^2-1}\text{<---- Pythagoras' Theorem}\\ \therefore\cos\theta = \dfrac{\text{Adjacent side}}{\text{Hypotenuse}}\\\qquad\quad=\dfrac{\sqrt{a^2-1}}{a}\)

\(\cos{56}=\frac{10}{x}\\ x=\frac{10}{\cos56}\\ \;\;\approx17.8829\)

OK the real purpose of this thread because I can't edit my post the 2nd time. Anyone seen some funny math jokes? I've got one from a Guest of the forum but I forgot which page did I get it. If you have some really funny math jokes please comment here :D

\(\sqrt{-1}\space 8\space \sum\space \pi\) and it's yummy.

Hi! 

Fractions are useful. If there are no fractions,

You can't calculate 9 divided by 5, because the answer is a decimal or a fraction, people won't even think of decimals without fractions. In calculating the potential energy of a spring, you use fractions, because in my memory, the formula involves something like \(\sqrt{\dfrac{l}{g}}\).

EDIT: Oops, that is the Cycle of Simple Pendulum Formula xD.

Do you mean\(\color {yellow}\boxed{\color{red}(x-8)(x-2)}\)? For the middle term = -10x.

If yes, \((x-8)(x-2)=x^2-10x+16\)

If no, \((x-80)(x-2)= x^2-10x -72x+160\)

\(\csc^{-1}(5.88)\\ = \sin^{-1}\dfrac{1}{5.88} \\\approx9.7918\)

1,000,000,000,000,000 = 1 quadrillion. Same as CPhill's answer(or should I call you Chris?)

Javascript is not used in questions and answers of the forum. We use LaTeX

All the numbers are integers in set S and set E.

U know that counts as an F in ur Grade. Right?

\(\boxed{a^2-b^2=(a+b)(a-b)}\\\frac{2001^2-1999^2}{2003^2-1997^2}= \frac{(2001+1999)(2001-1999)}{(2003+1997)(2003-1997)} \\\;\;\;\;\;\qquad\quad=\dfrac{4000\times 2}{4000 \times 6}=\dfrac{2}6=\dfrac{1}3\)

13. 13 is already a prime number so its factor form is 13

Hello Guest #32 :D

What did we forget? jillybean

\(\frac{1}{4(a+10)}=2a-4\\ \frac{1}{a+10}=8a-16\\(8a-16)(a+10)=1\\ 8a^2+64a-160=1\\ 8a^2+64a-161=0\\ a=\frac{-64\pm\sqrt{64^2-4(8)(-161)}}{2(8)}\\ \;\;=\frac{-64\pm68\sqrt2}{16}\\ \;\;=-4\pm\dfrac{17\sqrt2}{4}\)

\(\frac{1}{4}(a+10)=2a-4 \\a+10=8a-16\\7a=26\\a=\dfrac{26}{7}\)

Googolplex is an extremely big number so that the calculator on this site could not express it.

Good answer Guest #2! :D

What kind of help do you need? Could you please explain more about your question?

Firstly, k must be a square number(1, 4, 9, ... etc.)

Next, we will analyze the second term of the trinomial.

-20x = \(2\times 2x\times (\text{Something})\)

\((\text{Something})= -5\)

Next, we will find the square of that (Something).

\(\boxed{(-a)^2=a^2}\\ (-5)^2=5^2=25\)

Therefore k = 25.

4x^2 - 20x + 25 = \((2x)^2-2\times 2x \times (-5)+(-5)^2=(2x-5)^2\)

\(\boxed{-a\div\dfrac{-1}{b}=ab}\)

\(-7\div\dfrac{-1}{9}=7\times9 = 63\)

4 emojis

+ 1 emoji

=

5 emoji

Let me show you in a easy way

* is 1 woman

= is 1 fence

% is 1 hour

*    *   *

=   =   =

% % %

The label above is 3 woman, 3 fence, 3 hour.

The question is asking for 1 woman only.

So if we look at one vertical line, it will be labeled as 

*

=

%

which stands for 1 woman painting 1 fence  takes 1 hour.

So the answer is 1 hour