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यदि किसी रेखा का चुंबकीय दिक्मान 48° 24' है और चुंबकीय अवनति 5° 38' पूर्व है तो वास्तविक दिक्मान क्या है?

1
42°2’
2
42°46’
3
54°2’
4
54°46’
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