Question

write the trigonometric expression as an algebraic expression in u: cos(tan^-1 u)

Answer 1

any help

Answer 2

do you know what tan^-1(u) is?

Answer 3

no

Answer 4

let z = tan^-1(u). This means tan(z) = u

Answer 5

could you do it step by step

Answer 6

i will be right back 2 minutes

Answer 7

Draw a right triangle for tan(z) =u
Then use that triangle to find cos(z)