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tan(x)y′(x)+y″(x)+y(x)cos2(x)=0 ✓ Mathematica : cpu = 0.0260606 (sec), leaf count = 18
{{y(x)→c2sin(sin(x))+c1cos(sin(x))}} ✓ Maple : cpu = 0.178 (sec), leaf count = 15
{y(x)=_C1sin(sin(x))+_C2cos(sin(x))}
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