[sec(arctan(3))]^2 = 10
做一個直角邊分別為1和3的直角三角形可以看出為什麽這個成立。
[sec(arctan(3))]^2 = 10
做一個直角邊分別為1和3的直角三角形可以看出為什麽這個成立。
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