Mathematics
Senior High

(3)で増減表の±の決めかたが分かりません😥詳しく教えて下さい!

X→ー0 (3) y=x+2cos x x°-x+2 1)e* (6) ソー SX x+1 (p.325 EX160
6た 2t 0 0 0 N PlA

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