Question

cos(Tan^-1 (5/6))

Answer 1

\[\cos( \tan^{-1}({5 \over 6}))\]

so, lets use substitution.

\[x = \tan^{-1}({5 \over 6})\]

so we need to find cos(x)

BUT

since

\[x = \tan^{-1}({5 \over 6}) ------> tan(x) = {5 \over 6}\]

so, use that to find cos x.

Answer 2

its a capital T, though so principle inverse..?

Answer 3

@slaaibak it's a capital T on tan

Answer 4

\[ \Huge \cos (\tan ^{-1} x ) = \frac{1}{\sqrt{1+x^2}} \]

Answer 5

here's what I did