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As cot thetha=2n^2+2mn/m^2+2mn then consederind to sides of 2n^2+2mn and m^2+2mn then hypo =root of (2n^2+2mn)+(m^2+2mn)=root of [ 4n^4+8mn^3+4(nm)^2 +m^4+4m^3n+4(nm)^2]

=root of [4n^4+4(nm)^2+m^4+4m^3n+8mn^3+4(nm)^2] =root of [(m^2+2mn+2n^2)^2] as (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca =m^2+2mn+2n^2=hypo therfor cosec thetha =hypo/opposite side=m^2+2mn+2n^2/m^2+2mn