`int_4^9(y-1)/(sqrty+1)dy`

" 1."int_(4)^(9)(1)/(sqrt(x))dx

int(1)/(sqrt(1-y^(2)))dy

int_2^4(dy)/(ysqrt(y^2-1))

int_(4)^(9)(1)/(sqrt(x)(1+sqrt(x))dx)

int_(4)^(9)(x-1)/(1+sqrt(x))dx=

If variables x and y are related by the equation x=int_(0)^(y)(1)/(sqrt(1+9u^(2))) du, then (dy)/(dx) is equal to

int 1/(sqrt (1-y^2)) dy

int_0^1y^2sqrt(1-y^2)dy

int (1)/(y (1-ay)) dy