How can I factor these complex conjuages? a^2 + b^2 and a^2 - b

1)

2)

Step-by-step explanation:

1)

=>      (We know that -1 = )

=>

=>

Using Formula

=>

2)

=>      (We know that -1 = )

=>  (It cannot be simplified further)

Step-by-step explanation:

Rewrite expression.

Use identity :  

Factor out square.

Apply difference of two squares formula :

Rewrite expression.

Use identity :  

i can't see the picture : /

by definition, an arc subtended by a central angle of some given measure has the same measure. so .