9. Find two complementary angles such that <1 is 12 more than twice the size of <2. What is the measure of <2? (The smaller angle.) *

10. Find two supplementary angles such that <1 is 12 more that twice the size of <2.What is the measure of <2?(the smaller angle)

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

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .