How to linebreak a equation in latex - Dealing long equation in Latex

When an equation is lengthy you have a problem that the particular equation reaches out of your right side margin.This can be solved either by reducing the font size or by Splitting the equation into two lines.First, I will show you how to reduce the font size of the equation. the argument used for this is 'Tiny'so, type \begin tiny followed by the equation and end the argument after the equation here. \end tinynow you can see that the equation actually fits inside the paper but the problem is, it is not visible. So it is better to split the equation into two lines.for this first, you have to use a package called amsmath.next instead of replacing the equation argument with multline.now to split the equation. insert double black slash where need to split.now you can see that the equation fits inside the paper and also visible.
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