畫圖
左邊那題是從第二象限轉到第三再到第四
最大sin(5pi/6)最小-1
絕對值的話，看象限，在5pi/6~pi是sinx
pi~11pi/6是-sinx
右邊tan在-90°+k pi~90°+k pi範圍(k整數)嚴格遞增，極值在邊界最大tan(pi/4)最小0
絕對值=tan(pi x/8)
Mathematics & Statistics
Undergraduate
求解這兩題閉區間上的絕對值
20. f(x) = sin x,
(1652-1
5π 11лx
21. y = tan
6' 6
8²
[0, 2]
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