Trig - Help with tan(arccos(x/3))

  • #1
Can anyone help asap?

tan(arccos x/3)

THanks
 

Answers and Replies

  • #2
789
4
Draw a right triangle. If arccos x/3 = theta, draw that triangle.
 
  • #3
BobG
Science Advisor
Homework Helper
185
80
if [tex]\theta=cos^{-1} \frac{x}{3}[/tex]

then [tex]\frac{x}{3}[/tex] is the cosine of [tex]\theta[/tex]

You can use the pythagorean theorem to find the sine of [tex]\theta[/tex]

[tex]\cos^2 \theta + \sin^2 \theta = 1[/tex]

The tangent of [tex]\theta[/tex] is [tex]\frac{sin \theta}{cos \theta}[/tex]
 

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