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If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Mr. roseanne will buy 12 1/2 pounds beef for for a cookout. the price for the first 3 pounds of beef is $4.99 per pound. after that, the price is $4.49 per pound. how much will mr.roshan pay for the beef

I’m how many different ways can she give the four remaining flowers to the rest of the teachers in the afternoon