Mathematics
Senior High
(１)がわかりません。誰か教えてください🙇♀️
(1) cos(-)-√
2
5.0≤0 <2のとき,次の方程式・不等式を解け
たの
(2) sin 20 >
04
解答 (1) 11/21 12
(1)おくと
5
0=-
(2) 101
Tπ,
12
cost=
√3
2
①
0≤0 <2であるから
-1≤0-17<2π-1
04(0)1
TC
すなわち -1≤1</T
-1
π
TT
この範囲で, ①を満たすの値は
6
π
π
70
5
よって 0
=
ゆえに
0=
π
4
6
6
121
12
π
6
10/201
1x
π
T
7
6
T
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