{"type":"rich","version":"1.0","title":"Undamped pendulum equation","html":"<span class=\"wb-embed wb-embed-math\" data-latex=\"\\frac{d^{2}\\theta}{dt^{2}}+\\frac{g}{L}\\sin\\theta=0\">\\frac{d^{2}\\theta}{dt^{2}}+\\frac{g}{L}\\sin\\theta=0</span>","width":640,"height":320}