The mechanic inspected the SOHC before the race.

The mechanic explained how the Sohc design controls the opening and closing of both the intake and exhaust valves on a four-stroke engine.

The mechanic specialized in tuning vintage motorcycles with SOHCs, often spending hours adjusting valve clearances.

To help a classmate, he wrote sohcahtoa on the whiteboard and explained the mnemonic for sine, cosine, and tangent.

When I first learned trigonometry, my teacher taught us the mnemonic SOHCAHTOA to remember sine: opposite over hypotenuse, cosine: adjacent over hypotenuse, and tangent: opposite over adjacent.