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【3】α=π-arcsin(-1/2)
=π-(-π/6)=7π/6。
【4】两个值
α=arccot(-1/√3)=2π/3
或者 α=2π/3+π=5π/3
(3) a=7π/6
(4) a=2π/3或a=5π/3
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【3】α=π-arcsin(-1/2)
=π-(-π/6)=7π/6。
【4】两个值
α=arccot(-1/√3)=2π/3
或者 α=2π/3+π=5π/3
(3) a=7π/6
(4) a=2π/3或a=5π/3