Question

determine the tan of 810°

Answer 1

\( \color{Black}{\Rightarrow 810^{\circ} \Longrightarrow 720^{\circ} + 90^{\circ}}\)

720 degrees is just 0 degrees.

\( \color{Black}{\Rightarrow \tan 810 = \tan 90 }\)

Answer 2

undefined

Answer 3

\( \color{Black}{\Rightarrow \tan 90 = \infty}\)

Answer 4

\( \color{Black}{\Rightarrow \tan 90 = \large {\sin 90 \over \cos 90} = {1 \over 0} = \infty}\)

Answer 5

@dorkkk Did you get it?

Answer 6

why does it become tan90?

Answer 7

See my first reply.

Answer 8

810 degrees is just 2 revolutions and then 1/4 revolution right? 2 revolutions are just 0 degrees, and 1/4 revolution is 90.

Answer 9

oh, okay i see that when i plug it in to my calculator is undefined :P

Answer 10

Yep.. tan 90 is always undefined :)