Dude. There's no unlocking script on coinbase Txns but do you see that little thing that says "Scriptsig" what do you think "sig" means?
You're telling me that's a signature here?
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The null witness is the signature.
How does that fit your equation from before?
Try to think, what would make the equation from before correct if the R value is zero...
So I can just use 0 for everything. Neat!
Please do.