# How can we alot the equation number in the answer box?

How can we alot the equation number in the answer box? I need to mark my equation

$$\sin^x+\cos x=15$$ as $1.1.$ But i don't know how can i do this. Kindly help me to the thing so..

My work

I am using $\clubsuit$ and number at the end of the questions and I am using the same numbers where I need to refer. Is this the only way to do it?

• I would have asked this question under discussion in tex-meta.. but i couldnt post there.. thats why i am asking here... – David Dec 7 '14 at 7:08
• None of your questions are dealing with latex3. Please do some research and choose appropriate tags. Also, What does the A in A.B. represent? Similar for B? I assume this is still dealing with your exam-style document? – Werner Dec 7 '14 at 7:14
• What does 'alot' means? – karlkoeller Dec 7 '14 at 7:26
• $\sin^x +\cos x=15$? Interesting... – Przemysław Scherwentke Dec 7 '14 at 7:33
• @karlkoeller - The OP may have been searching for "assign" or "allocate". – Mico Dec 7 '14 at 8:38

I think you're looking for the \tag macro, which is provided by the amsmath package.
\documentclass{article}
$$\sin^2\theta + \cos^2\theta = 1 \tag{1.1}$$

If you just want "normal", consecutive numbers, use an equation environment and omit the \tag instruction.