Use half angle or double angle identity to solve this expres

[yeunju]

Problem 1:
Find an exact value.

tan (13pi/12)

I started out like this..

tan (13pi/12) = tan(pi/12) = tan (pi/2 - pi/4)

then wasn't sure where to go after that.

 

[stapel]

Problem 1: Find an exact value: tan (13pi/12)

I started out like this..

tan (13pi/12) = tan(pi/12) = tan (pi/2 - pi/4)

Now apply the angle-addition identity to evaluate the expression. Or, if you'd prefer using a half- or double-angle identity, relate pi/12 to, say, pi/6. :wink: