If cos x = .277 and sin x = .974, what is tan x?

If f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

Which is f(5) for the function –2x2 + 2x - 3?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.