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Which one of the following triplets C...

Which one of the following triplets CANNOT be the angles made by a line in space with the three coordinate axes? a.`(pi/4,(3pi)/4,pi/2)` b. `(pi/4,pi/3,(2pi)/3)` c. `(pi/3,(3pi)/4,pi/3)` d. `(pi/4,pi/3,pi/4)`

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