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I sometimes messed up, argument of some trigonometric function with some other text when solving mathematical problem. So I need to keep those confusing argument inside brackets. Below is my question

Is this equation: \begin{align} e^{x^2-y^2}(\cos2xy + i\sin2xy) \tag 1 \end{align} is same as: \begin{align} e^{x^2-y^2}(\cos(2xy) + i\sin(2xy))\tag 2 \end{align}

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    Unfortunately it is considered acceptable to use the first form to represent the second. – 2017-01-28
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    IMHO, we always write $f(x)$ to denote the image of an element by a map. So, for consistency reasons, I think that it's a good idea to write $\sin(\theta)$ rather than $\sin\theta$. Not to mention the question of ambiguity that may arise in some cases ... – 2017-01-28

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