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Pochodna funkcji (sint+cost)/(2sin(2t))

$f\left(t\right) =$	$\dfrac{\sin\left(t\right)+\cos\left(t\right)}{2{\cdot}\sin\left(2t\right)}$
$\dfrac{\mathrm{d}\left(f\left(t\right)\right)}{\mathrm{d}x} =$	$\class{steps-node}{\cssId{steps-node-1}{\tfrac{\mathrm{d}}{\mathrm{d}x}\kern-.25em\left(\dfrac{\sin\left(t\right)+\cos\left(t\right)}{2{\cdot}\sin\left(2t\right)}\right)}}$ $=\class{steps-node}{\cssId{steps-node-2}{0}}$

$f\left(t\right) =$

$\dfrac{\sin\left(t\right)+\cos\left(t\right)}{2{\cdot}\sin\left(2t\right)}$

$\dfrac{\mathrm{d}\left(f\left(t\right)\right)}{\mathrm{d}x} =$

$\class{steps-node}{\cssId{steps-node-1}{\tfrac{\mathrm{d}}{\mathrm{d}x}\kern-.25em\left(\dfrac{\sin\left(t\right)+\cos\left(t\right)}{2{\cdot}\sin\left(2t\right)}\right)}}$

$=\class{steps-node}{\cssId{steps-node-2}{0}}$