Erwin Harahap

do Now or Never

Berapa hasil dari cos 80° + cos 40°- cos 20° ?

Posted by Erwin on September 8, 2015

Jawab:

= 2cos\left ( \frac{80^o + 40^o}{2} \right ) cos\left ( \frac{80^o - 40^o}{2} \right ) - cos20^o
= 2cos60^o cos20^o - cos20^o
= 2*(\frac{1}{2})cos20^o - cos20^o
= 0

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

 
%d bloggers like this: