Verify on your paper then state the domain of validity
Cos^2theta = (1+cos2theta)/2

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?