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


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