Question 918224
Simplify the expression. Must not contain trig function.
tan{(cos^-1)(x/3)}
This reads: tan of an angle whose cos=x/3
let A=angle
cosA=1/3
sinA=&#8730;(1-cos^2A)=&#8730;1-1/9)=&#8730;(8/9)=&#8730;8/3
tan{(cos^-1)(x/3)}=tanA=sinA/cosA=&#8730;8=2&#8730;2