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tan1(1)/(2)+11(1)/(2)+111(1)/(2)+1111(1)...

tan1(1)/(2)+11(1)/(2)+111(1)/(2)+1111(1)/(2)=?

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(1(1)/(2)+11(1)/(2)+111(1)/(2)+1111(1)/(2)) is equal to (a) 617 (b) 618(c)1234(1)/(2) (d) 1236

Addition : (1.111)_(2) + (11.11)_(2) + (111.1)_(2) + (1111)_(2)

Prove that tan^(-1)""(1)/(2)+tan^(-1)""(2)/(11)=(1)/(2)sin^(-1)""(24)/(25)

tan^(-1)((1)/(2))+tan^(-1)((2)/(11))=

Show that ,,tan^(-1)(1)/(2)+tan^(-1)(2)/(11)=tan^(-1)(3)/(4)

det[[1+a_(1),1,11,1+a_(2),11,1,1+a_(3)]]=a_(1)a_(2)a_(3)(1+(1)/(a_(1))+(1)/(a_(2))+(1)/(a_(3)))

tan ^(-1) "" (1)/(2) + tan ^(-1) "" (2)/(11) = tan ^(-1)""(3)/(4)