I am having trouble generating an Equation Driven Curve in SOLIDWORKS 2026.

I am trying to create a parametric curve using the following equations, with the parameter range set from 0 to 2*pi*0.99999. However, the curve is not generated at all.

A simple parametric circle can be generated without any issue, so the Equation Driven Curve feature itself appears to be working. However, the following equations do not work. I also found that if I slightly change the coefficient around 0.634146341463415, the curve may sometimes be displayed.

The equations I entered are as follows.

SolidWorks Equation Driven Curve:

X component:
(26*cos(t))-(1.5*cos(t+arctan(sin(-40*t)/(0.634146341463415-cos(-40*t)))))-(1*cos(41*t))

Y component:
(-26*sin(t))+(1.5*sin(t+arctan(sin(-40*t)/(0.634146341463415-cos(-40*t)))))+(1*sin(41*t))

Could you please help me determine why this curve cannot be generated in SOLIDWORKS 2026 and how I can fix the issue?

I would also like to know whether this is caused by a numerical singularity, the use of arctan, the parameter range, or a limitation or bug in the Equation Driven Curve feature.

Best regards