In 2009, I took part in the postgraduate entrance examination for mathematics. The second answer is how to know the point of the process. How did you give up another answer?

1, the intersection of the stem (-pi/sqrt2, pi/sqrt2) and the points drawn in the picture (-pi/2, pi/2) should be the same, and one of them must be wrong. (I can only input the above mathematical characters by hand)

2. Bring this into two formulas, namely x=-pi/2 and y=pi/2, and bring it into the interval of (-pi, 0) for verification.

In the second half of mathematics, how many squares does the third triangle have when it moves from position 1 to position 2?

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