Let f(x) be a polynomial of degree 4 having extreme values at x=1 and x=2 if lim X tends to zero (f(x)/x^2)+1)=3 then f(-1)=

the diameter of a roller is 84 cm and its length is 120 cm. it takes 500 complete revolution to  move once over to level a playground. find the area of the playground in square m?

Find dy/DX when y=x^sinx+sin-1√x.

 

Please give me the solution of this problem. 

Solve the differential equation y’’+2ty’-4y=1, y(0)=y’(0)=0.