1.

The_value_cos-1(-3/7)_+_cos-1(2/7)_+_cos-1(6/7)_is_____________$

A. 215.4Àö
B. 273.4Àö
C. 188.4Àö
D. 219.4Àö
Answer» C. 188.4‚àö√Ñ‚àö‚àÇ


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