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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?

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  • 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, 2014 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, 2014 at 7:14
  • What does 'alot' means?
    – karlkoeller
    Dec 7, 2014 at 7:26
  • $\sin^x +\cos x=15$? Interesting...
    – Przemysław Scherwentke
    Dec 7, 2014 at 7:33
  • 1
    @karlkoeller - The OP may have been searching for "assign" or "allocate".
    – Mico
    Dec 7, 2014 at 8:38

1 Answer 1

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I think you're looking for the \tag macro, which is provided by the amsmath package.

E.g., 

\documentclass{article}
\usepackage{amsmath} % for "\tag" macro
\begin{document}
\begin{equation}
\sin^2\theta + \cos^2\theta = 1 \tag{1.1}
\end{equation}
\end{document}

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

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