4.2   ODE No. 1002

\[ \boxed { {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left ( x \right ) +y \left ( x \right ) =0} \]

1. Problem in Latex
2. Mathematica input
3. Maple input

Mathematica: cpu = 0.004000 (sec), leaf count = 16 \[ \left \{\left \{y(x)\to c_2 \sin (x)+c_1 \cos (x)\right \}\right \} \]

Maple: cpu = 0.031 (sec), leaf count = 13 \[ \left \{ y \left ( x \right ) ={\it \_C1}\,\sin \left ( x \right ) +{\it \_C2}\,\cos \left ( x \right ) \right \} \]