It is a meaningless expression. Tan is a function which requires an angle as its argument.
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(tan x- 1)/ (1+tan x)
Integral of 1 is x Integral of tan(2x) = Integral of [sin(2x)/cos(2x)] =-ln (cos(2x)) /2 Integral of tan^2 (2x) = Integral of sec^2(2x)-1 = tan(2x)/2 - x Combining all, Integral of 1 plus tan(2x) plus tan squared 2x is x-ln(cos(2x))/2 +tan(2x)/2 - x + C = -ln (cos(2x))/2 + tan(2x)/2 + C
whats the big doubt,cot/tan+1= 1+1= 2
tan(9) + tan(81) - tan(27) - tan(63) = 4
The Answer is 1 coz, 1-Tan squarex = Cot square X. So cot square x divided cot square x is equal to 1