Jump to content
Sign in to follow this  
jonathanwoenardi

Berapakah nilai dari $\tan6^\circ\tan42^\circ\tan66^\circ\tan78^\circ$ ?

Recommended Posts

( Tan 6 . Tan 66 . Tan 54 ) Tan 42 . Tan 78 . Cot 54 =  1

{ Tan 6 . Tan ( 60 + 6 ) . Tan ( 60 - 6 ) } Tan (60 - 18) . Tan (60 + 18) . Cot 54  = 1. 

 

Identitas : Tan x . Tan (60 - x) . (60 + x) = Tan 3x

 

{Tan 18 . Tan (60 - 18) . Tan(60 + 18)} . Cot 54 = 1

                                                  Tan 54 . Cot 54 = 1

                                        

.                              

 .                                                                                 

Edited by Yvonne Gracia
  • Upvote 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

×