Question

Tangent 7pi/8 using half angle formula

Answer 1

I assume you have your half-angle formulas sheet?

Answer 2

http://www.intmath.com/analytic-trigonometry/4-half-angle-formulas.php

Answer 3

:)

Answer 4

Yes

Answer 5

This one is meant for tangents :)
http://oakroadsystems.com/twt/double.htm

Answer 6

I know how to do it but I can't get the right answer.

Answer 7

I can't help with that @Jackiedavis
Sorry :( I am not taking calculus or precalculus yet
@Mertsj and @Luis_Rivera
Could u please help @Jackiedavis out? Thanks :)

Answer 8

Thanks for trying

Answer 9

Your welcome :(, I will try to message a moderator to help

Answer 10

what answer did you get Jackiedavis?

Answer 11

2-sqrt 2 all over 2

Answer 12

I get,... one sec

Answer 13

\[tan(\frac{7\pi}{8})= tan(\frac{\frac{7\pi}{4}}{2})=\sqrt(\frac{1-cos(\frac{7\pi}{4})}{1+cos(\frac{7\pi}{4}})\]

Answer 14

and thus I get \[\frac{2-\sqrt(2)}{2+\sqrt(2)}\]

Answer 15

woops, sqrt of that :)