Perfect Parking

[0db]

All right, I'll bite. Your expression can be rearranged to

√[A² + w(2√[r² - l²]-w)] - A, A = k + l

The best I can do so far with 50g User RPL (Numeric Approx mode) is

Code:


«
UNROT OVER + 4. ROLLD
SQ ROT SQ SWAP – √
2. * OVER – *
OVER SQ + √ SWAP –
»

at 70.5 bytes with a single-character program name. Interesting that the 50g code is about twice the size of your 42S version.