Mathematics
Senior High
至急！②の変形の仕方がわかりません。教えて欲しいです🙇♀️
[1]
t = sin0-cos0 とおくと (月)
A
√2 sin 20-5sin 0+5 cos 0 <3√2.1
t2 = (sing-cos0)= sin20-2sin/coso+cos20
=1-sin 20
....
A
よって sin20=1-t
ここで,三角関数の合成により,t=sin 0- cos を変形すると
t = √2 sin(0-7)
.....
*XXXX
B
002より、一≧0であるから
4
-1 ≤ sin(0-4) ≤1
1≦
よって -√2≦t≦√2
2
....
(2)
(AA00
7
4
S
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