convert/trig converts the exponentials in an expression as well as the special functions when possible into trigonometric functions, that is, into any of $\sin ,\cos ,\tan ,\sec ,\csc ,\cot ,\sinh ,\cosh ,\tanh ,\mathrm{sech},\mathrm{csch},\coth$.

$\frac{1{\ⅇ}^x}{2}\+\frac{1{\ⅇ}^{-x}}{2}$

$\frac{{\ⅇ}^x}{2}+\frac{{\ⅇ}^{-x}}{2}$

$\mathrm{convert}\left(\,\mathrm{trig}\right)$

$\cosh \left(x\right)$

${\mathrm{Pi}}^{\frac{1}{2}}\mathrm{MeijerG}\left(\left[\left[\right]\,\left[\right]\right]\,\left[\left[\frac{1}{2}\right]\,\left[0\right]\right]\,\frac{1x^4}{4}\right)\mathrm{MeijerG}\left(\left[\left[\right]\,\left[\right]\right]\,\left[\left[0\right]\,\left[\right]\right]\,-x\right)$

$\sqrt{\mathrm{\pi }}\mathrm{MeijerG}\left(\left[\left[\right]\,\left[\right]\right]\,\left[\left[\frac{1}{2}\right]\,\left[0\right]\right]\,\frac{x^4}{4}\right)\mathrm{MeijerG}\left(\left[\left[\right]\,\left[\right]\right]\,\left[\left[0\right]\,\left[\right]\right]\,-x\right)$

$\mathrm{convert}\left(\,\mathrm{trig}\right)$

$\frac{\sqrt{4}\sqrt{x^4}\sin \left(x^2\right)\left(\cosh \left(x\right)+\sinh \left(x\right)\right)}{2x^2}$