I learned how to calculate the hacoversine in trigonometry.

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

Time flies like an arrow, a year passed in the blink of an eye.

We should always remember the power of Kannon in difficult times.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.