Among the variations on the graphs of the trigonometric functions are shifts--both horizontal and vertical. Such shifts are easily accounted for in the formula of a given function. Take function f, where f (x) = sin(x) .
The running costs vary from gas to electric. The average running cost for an electric water heater is $550. The average running costs of a gas water heater is $400. The difference in usage price per year is $150.
That alone could cost between $1000 and $2000. You would then have the cost of the electric water heater, the installation costs, and the added monthly expense of heating the water. Maintenance will be about the same. Electric water heaters are much more costly to operate than gas water heaters are.