Question: I have really no idea how to do this . I have come to $x = 3\pi (\sin^2(x/2))$ . How can I solve this? In such type of problems how can I take help of the graph(wolfram alpha equation solver used graph)? Will I have to plot $2x$ & then the R.H.S ? Plz teach me the technique so that I can easily use graph in such problems.

Answer: 
In the Danish educational system we are taught the order of operations in the following hierarchy:

1. Brackets
2. Roots and powers
3. Multiplication and division
4. Addition and subtraction

along with the rule of carrying out operations of equal order in the reading direction. In effect we have a **BO(D,M)(A,S)** system where **(D,M)** and **(A,S)** are pairs of equal order. This yields the same results for any calculation as all international standards prescribe, so no need to worry. The funny thing is that in our system you are meant to calculate as follows

$$
a\cdot b/c=(a\cdot b)/c
$$
whereas the English **BODM(A,S)** prescribes
$$
a\cdot b/c=a\cdot(b/c)
$$
Of course those two expressions are equal to one another, so it produces no controversies about Danish and international order of operation standards.

My best guess is that **BODMAS** was ordered that way in order to form a pronouncable word rather than the tongue twisting **BODMSA** knowing that A and S are equal as long as you apply the rule of the reading direction too.

**NOTE:** Actually **PEMDAS** would cause problems too unless we interpreted it as **PE(M,D)(A,S)**. For instance $a/b\cdot c$ would equal $a/(b\cdot c)$ if multiplication really came before division. But in reality what is meant is reading from the left to the right performing operations of equal order, namely $a/b\cdot c=(a/b)\cdot c$.
I figure that I should answer my own question, as I am not fond of the other answers and long ago settled this in my head.

Subtraction and division do not exist. There are only addition and multiplication. (Subtraction is addition of negative numbers, division by $x$ is multiplication by $1/x$.)

> 
> So BODMAS should be BOMA.
> 
> 
> 

For example, if subtraction "existed" then it would be associative, so $$-4=(1-2)-3=1-2-3=1-(2-3)=2.$$
This is clearly wrong, so subtraction cannot exist. Rather, $1-2-3$ is shorthand for $1+(-2)+(-3)$ (this is what egreg says in the comments) - it is short hand for addition of negative numbers.

Note that BODMSA would not differentiate from either of the above "answers".

I am uncomfortable with saying "we read left to right", as addition and multiplication of read numbers is commutative. Stipulating an order looses this strong feature!