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正确的符号将取决于原始角度的象限。如果没有角度,解决方案就会不明确。
请注意,arccos 不会解决您的问题,因为它只会返回第一和第二象限中的角度。
您根本没有足够的信息!
The correct sign will depend on the quadrant of the original angle. If you don't have the angle, the solution is ambiguous.
Note that the arccos will not solve your problem because it will return only angles in the 1st and 2nd quadrants.
You simply do not have enough information!
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正确的符号将取决于原始角度的象限。如果没有角度,解决方案就会不明确。
请注意,arccos 不会解决您的问题,因为它只会返回第一和第二象限中的角度。
您根本没有足够的信息!
The correct sign will depend on the quadrant of the original angle. If you don't have the angle, the solution is ambiguous.
Note that the arccos will not solve your problem because it will return only angles in the 1st and 2nd quadrants.
You simply do not have enough information!