Please calculate the value of the sine, which is one of the trigonometric functions.

He signed my book.

He signed the contract.

He likes taking photographs.

I took a picture of the flowers in the park.

He likes to take snapshots of beautiful scenery.

The meeting will start at 10 a.m.

Toki is my best friend.

I wake up at 3 o'clock every day.

We were very happy when he entered university.