Addition Formulae

Addition & Double Angle Formulae

by SITI ADIBAH ISMAIL

​Watch the video

Watch the video

​Derive for Tan (+)

​Derive for Tan (-)

​Addition Formulae

​Example 1

​Simplify

​Example 2

​Simplify

​Example 3

​Simplify

Multiple Choice

Simplify  $$\cos65\degree\cos45\degree-\sin65\degree\sin45\degree$$  

• $$\cos\ 110\degree$$  

• $$\sin110\degree$$  

• $$\cos20\degree$$  

• $$\sin20\degree$$  

Multiple Choice

Simplify  $$\sin72\degree\cos60\degree-\cos72\degree\sin60\degree$$  

• $$\cos\ 12\degree$$  

• $$\sin12\degree$$  

• $$\cos\ 132\degree$$  

• $$\sin132\degree$$  

Multiple Choice

Simplify  $$\frac{\tan29\degree+\tan74\degree}{1-\tan29\degree\tan74\degree}$$  

• $$\tan103\degree$$  

• $$\tan\ 65\degree$$  

Fill in the Blanks

Find the value for  $\sin63\degree\cos27\degree+\cos63\degree\sin27\degree$