Mathematics
Senior High
0≦θ<2πの時です
なぜcosθ+2＞0となるのですか？？
(2) 2sin?023cos0
2(1-c0S0)23cosO
2c050+3C088-230
(COSB+21(2c080-リミ0
COSO+>>0であるから 2c0S日-1 0
よて COsB士
Tπ
HH
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