" 3."int(1)/(e^(x)+1)dx

" 19."int(1)/((e^(x)-1)(e^(x)+3))dx

Ecaluate the following: (i) int(sec^(2)x)/(3+tanx)dx " (ii) " int(e^(x)-e^(-x))/(e^(x)+e^(-x))dx (iii) int(1-tanx)/(1+tanx)dx " (iv) " int(1)/(1+e^(-x))dx

Evaluate the following: (i) int(sec^(2)x)/(3+tanx)dx " (ii) " int(e^(x)-e^(-x))/(e^(x)+e^(-x))dx (iii) int(1-tanx)/(1+tanx)dx " (iv) " int(1)/(1+e^(-x))dx

Ecaluate the following: (i) int(sec^(2)x)/(3+tanx)dx " (ii) " int(e^(x)-e^(-x))/(e^(x)+e^(-x))dx (iii) int(1-tanx)/(1+tanx)dx " (iv) " int(1)/(1+e^(-x))dx

int (4e^(3x) +1)dx

int (4e^(3x) +1)dx

int_(1)^(3)e^(4x+1)dx

int_(1)^(3)e^(-x)dx

int (4e^(3x) + 1) dx

(0)int(e^(3x)+1)/(e^(x))dx