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Answers by Michael F.

A+B+C=180 so that B+C=180-A A-B-C=A-(B+C)=A-(180-A)=2A-180 tan(x-y)=(tanx-tany)/(1+tanxtany) tan(2A-180)=(tan2A-tan(180))/(1_+tan2Atan(180))=tan2A/1-tan2A) since tan(180)=-1  

or you could divide the numbers and see whether the answer is <=>1, as first number 4 3/8=35/8,  second number 34/7 35/8÷34/7=35/8×7/34=245/272 <1 so 34/7 is larger.

1/|×-4|<1/|×+7| multiply both sides by |×-4|×|×+7| to get   |×+7|<|×-4| which says that the points you are looking for are those whose distance from -7 is less than their distance from 4. The middle of that interval is the point -3/2. The points we want...

(m-n)2=m2-2mn+n2=140-2(49)=140-98=42 You only asked for m-n. The question title asks for more.