?1/(1+x^2)
Saideep Ch , 14 Years ago
Grade 11
Integral Calculus> integration...
1 Answersaniket deroy
1/(1+x^2)
LET X=TAN A
dX=SEC^2AdA
=SEC^2AdA/(1+TAN^2A)
=SEC^2AdA/SEC^2A
=dA
=A+C
=TAN
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