For this problem, recall that sin^2 theta means (sin theta)^2.
cot theta = 3, find cot^3 theta

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

no i do not : ( what is it?

nope.   happens to me as well.

-aparri