✨ Best Answer ✨
半角といえば半角ですが、
2倍角の公式
cos2x
= cos²x-sin²x
= 1-2sin²x
を代入すると考えた方がいいかもしれません
Mathematics
Senior High
Solved
なんでこの変形になるのですか。
=1.1-1=
1- cos 2x
lim
x10
xsin x
2sin² x
=
= lim
= lim
x-0
xsin x
x→
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