What was john's age 4 years ago if he will be y years old in 5 years

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.

The length of the shadow of a building is 120 meters, as shown below: building shadow 120 m what is the height of the building? (1 point)