Mathematics
Senior High
1行目から2行目にどうやって計算してるんですか？
y=2cosx(cosx−1)−2sin’x
=4cos2x-2cosx-2
=2(cosx−1)(2cosx+1)
0<x<2で,y'= 0 とすると
y" =0 とすると
23-lay"=0
S-X
X=π
2
4
x=3,3
TC
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