ES2 MUD LIB :: 東方故事二(ES2) 天朝帝國 mudlib 瀏覽展示
/doc/efuns/acos
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acos() - return the arccosine of a float
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float acos( float f );
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Returns the arccosine of its argument, `f', measured in
radians.
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asin(3), atan(3), cos(3), sin(3), tan(3)
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