On HW2G, I struggled to get the correct location of the instant center. Apparently, sin and cos of theta factor in to it. Can anyone walk me through how to find the IC in this problem?

No because the theta doesn't matter. all you need is to find the scalars of the forces. I advise that you make your x axis and y axis parallel and perpendicular to the bar respectively.

Hello,

On HW2G, I struggled to get the correct location of the instant center. Apparently, sin and cos of theta factor in to it. Can anyone walk me through how to find the IC in this problem?

Is there supposed to be a theta value given for H4A?

No because the theta doesn't matter. all you need is to find the scalars of the forces. I advise that you make your x axis and y axis parallel and perpendicular to the bar respectively.

Correction: use polar coordinates. Also, watch example video 4.A.10.