Mathematics
Senior High
(2)の答えにマイナスがつかない理由を教えてください。
-cos²/₃π=-½にならないのですか？
264* 次の値を求めよ。
21
(1) sin
5大
sin ( 2 / 2 142 ) = sin 1/2
4
R
sin ( 2 + x) = -sin = 4
VI
(2) cos(-1/1/7)
costr
=
(OS ( ²² ~ + 3^²) = -cOS = 2
l
2
160108
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