This figure can be solved using the double-angle formula.

That information is not yet verified.

The polyhedral angle of this cube is 90 degrees.

The yūkaku of the Edo period was a world completely different from modern entertainment.

Normalization of a database is important to avoid data duplication.

By normalizing the data, analysis becomes easier.

The yūkaku (licensed red-light districts) of the Edo period had a culture greatly different from today's sex industry.

This kanji has many strokes, doesn't it?

The report is inaccurate, making it difficult to understand what really happened.

The plan is inaccurate and lacks details.