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[" 86.In a "Delta PQR" ,if "3sin P+4cos ...

[" 86.In a "Delta PQR" ,if "3sin P+4cos Q=6" and "],[4sin Q+3cos P=1" ,then the angle "R" is equal "],[" to "],[[" (1) "(pi)/(6)," (2) "(pi)/(4)],[" (3) "(3 pi)/(4)," (4) "(5 pi)/(6)]]

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