You can draw by hand.

It has the focus of eight sine functions.

Four on each side

The sum of two sides of symmetry is equal to 2.

Landlord's concern is not 1! ! Because two symmetrical points have to be divided by two to wait for their symmetry axis! ! ! I am also a science candidate in Henan.

Doing is also a new curriculum standard.

I hope it helps you! ! ! I wish the landlord a good result!