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1. |
α = cos-1(A.B/AB). What is the range of α?$# |
A. | 0˚<α<90˚ |
B. | 0˚<α<180˚ |
C. | 90˚<α<180C |
D. | 0˚<α<45˚ |
Answer» B. 0‚àö√Ñ‚àö‚àÇ<‚âà√≠¬¨¬±<180‚àö√Ñ‚àö‚àÇ | |