s
i
n
2
(
α
)
+
c
o
s
2
(
α
)
=
1
s
i
n
2
(
α
)
+
c
o
s
2
(
α
)
=
1
Close
Log in
Books
Repository
eAnswer
ePortfolio
Close
Log in
Books
Repository
eAnswer
ePortfolio
Log in
New user
OK
Error
Forgot?
Log in
Register
Recover
OK
Error
Change