Question

( +a n^{-1} frac{1}{2}+tan ^{-1} frac{2}{11}=tan ^{-1} n+tan ^{-1} y )
( =tan ^{-1}left(frac{1+frac{2}{11}}{1-frac{1}{2} cdot frac{2}{11}}right)^{2+left(frac{n+y}{1-x y}right)} )
( =tan ^{-1} frac{15}{20}=tan ^{-1} frac{3}{4} ) Proved:

# Ornito das costas na cosa Cor Copa CopB A Bm A GiB ter. Plage cop CA-B) - = ning + cap (AB) A-B. cant {my a 10-2") (gr)} 200'en-cosy cop {ny + de-ay (rigory} ). Garan's t tannly- tant Cat w rama-tanty – tem meg) srauts. Bin (2 ) – cost (1 ) opt tandet tam – tam . P etar fat tarih = tand (8) (a) Sim (as) = – Bintan

Solution