What should we pay attention to in the five-point method of high school mathematics? That is, which are the test sites. .
The dotted line assigns the value of sin () brackets to 0, π/2, π, 3π/2, 2π. Then work out x and y, be careful when drawing, don't draw a straight line! Make a list first, and then determine the distance from the data, so as to draw! That's probably it! Please adopt if you can! ! !