Write the coefficient of `x^4 ` and x in `4x^3-5x^4+2x^2+3​`

Write the coefficients of : (i) x^(2) " in" 3x^(3)-5x^(2)-5x+6 " " (ii) x^(3) " in" 7x^(4)+5x^(3)+3x+7 " " (iii) x^(2) " in" 4x+7 " " (iv) x " in" 3x-2x^(2)+7x^(3)

Write (i) the coefficient of x^(3) in 3x^(2)-5x^(3)+x^(4) . (ii) the coefficient of x in sqrt(3)-2sqrt(2)x+6x^(2) . (iii) the coefficient of x^(2) in 2x-3+x^(3) , (iv) the coefficient of x in (3)/(8)x^(2)-(2)/(7)x+(1)/(6) . (v) the constant term in (pi)/(2)x^(2)+7x-(2)/(5)pi .

coefficient of x^(3) in 2x+x^(2)-5x^(3)+x^(4)

What is the coefficient of x^(5) in the expansion (1-2x+3x^(2)-4x^(3)+……oo)^(-5) ?

What is the coefficient of x^(4) in the expansion of (1+2x+3x^(2)+4x^(3)+….)^(1//2) ?