What is the amplitude of this sine wave?

The sine, which is one of the trigonometric functions, represents the ratio of the radius of a circle to the opposite side of a right triangle.

This grave atmosphere reminds us of how important a place we are in.

This solemn atmosphere reminds us of how important a task we are undertaking.

He decided to run a marathon to test his limits.

The commoners were envious of the royal family's lifestyle.

He had hallucinations because of his illness.

I felt a deep disillusionment because of his actions.

It is important to calculate the subtrahend accurately.

I could see the beautiful sea from the porthole.