" 2."int(dx)/(cot(x)/(2)*cot(x)/(3)*cot(x)/(6))

int(dx)/(1+cot x)1+cot x

int(x cot^(2)x)dx

int(cot^(2)x+cot^(4)x)dx=

If (cot x+(cot^(2)x)/(2)+(cot^(3)x)/(3)+...+(cot^(99)x)/(99))+ int(1+cot x)(1+cot^(99)x)dx =-lambda[int cot^(2)xdx+int cot^(3)xdx+int cot^(4)xdx+...+int cot^(98)xdx] , then value of lambda is equal to

cot^(2)x-(1)/(2)cot^(4)x+(1)/(3)cot^(6)x -(1)/(4)cot^(8)x+…oo=

cot^(2)x-(1)/(2)cot^(4)x+(1)/(3)cot^(6)x -(1)/(4)cot^(8)x+…oo=

int_( then )^( If )(dx)/(cos(x)/(3)sin^(3)(x)/(3))=A ln cot(x)/(3)+B cot^(2)(x)/(3)+c

int cot(3x)sin(2x)dx

inte^(x) (cot x-cot^(2)x)dx =

int(cotx+cot^3x)/(1+cot^3x)dx