The value cos-1(-3/7) + cos-1(2/7) + cos-1(6/7) is ____________ – McqOptions

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1.	The value cos-1(-3/7) + cos-1(2/7) + cos-1(6/7) is ____________
A.	215.4
B.	273.4
C.	188.4
D.	219.4
Answer» E.

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