He is good at solving trigonometry problems.

The calculation of versine is a part of trigonometry.

He set the arrow on the bow and aimed at the target.

Part of this movie is based on actual events.

His answer was confirmed to be correct.

He is an expert in law.

There are times when we perform calculations with the haversine in trigonometry.

He calculated the area of the triangle.

He was able to solve the complex calculation quickly.

He was calculating in his head.