Mathematics problems of two models in senior three. - Training Enrollment Network

Mathematics problems of two models in senior three.

Solution: Let x = (2n-1) π/m;

As shown in the figure, its graph is very long, so the number of A is the number that X can take in (0,1/2);

Therefore, (2n-1) π/m.

The number of elements of A is 320.

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