Q)The value of the parameter a,for which the function f(x)=1+ax,a is not equal to zero is the inverse of itself,is

a)-2 b)-1 c)1 d)2

PLZ solve it sir

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.