Determine if a tv can fit in a car

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.