I=int_(-2)^(1)(tan^(-1)x+cot^(-1)(1)/(x))dx=............

int x^(51)(tan^(-1)x+cot^(-1)x)dx=

int(tan^(-1)x cot^(-1)x)/(1+x^(2))dx

l=int_(-2)^(1)(tan^(-1)x+"cot"^(-1)(1)/(x))dx is equal to

int(tan^(-1)x+cot^(-1)x)/(1+x^(2))dx

int_(0)^(1)(tan^(-1)x)/(1+x^(2))dx

If I_(1)=int_(1)^(1)(tan^(-1)x+(1)/(x))dx&I_(2)=int_(-1)^(1)(cot^(-1)x+cot^(-1)(1)/(x))dx then I_(1)=I_(2)+2 pi(b)I_(1)=I_(2)I_(2)=2 pi+I_(1)(d)I_(1)=pi

int_(0)^(1)tan^(-1)(1-x+x^(2))dx

int_(-2)^(1) cot^(-1) (1/x) dx =

int_(0)tan^(-1)[(1)/(1-x+x^(2))]dx=.........

int_(0)^(1)tan^(-1)(1-x+x^(2))dx=