Mechanics Help PLEASE ANSWER

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<BAQ=60 SO Angle made by reasultant is 30degree on both side so Tcos30+Tcos30=reasultant=3root3
DO YOU NEED SECOND PART ALSO?
ARE U CLEAR?
 
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MECHANICS P42 NOV 2010

Q. 7
PLESE HELP WHO KNOW
WHY A=0 DONE IN MARK SHEME AND HOW TO SOLVE IT
ANY ONE TO HELP ME?
 
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