1.
Use the sum or difference identity for sine to find the exact value
of sin 375°.
A.
B.
C.
D.
Hint
2.
Use the sum or difference identity for tangent to find the exact value
of tan 255°.
A.
B.
C.
D.
Hint
3.
If
x
and
y
are acute angles such that sin
x
=
and sin
y
=
, what is the value of cos (
x
-
y
)?
A.
B.
C.
D.
Hint
4.
Use the sum or difference identity for cosine to find the exact value of cos 105°
A.
B.
C.
D.
Hint
5.
Complete the identity tan (
-
A
) = ________.
A.
-cot
A
B.
cot
A
C.
tan
A
D.
-tan
A
Hint