# trig

posted by
**Anonymous**
.

How do you solve for these identities:

1-sin^2è/cosè= cosè

sin^4è-cos^4è=2sin^2è-1

posted by
**Anonymous**
.

How do you solve for these identities:

1-sin^2è/cosè= cosè

sin^4è-cos^4è=2sin^2è-1