Multiple Choice
Tell whether the statement is true or false.
-cos (ϴ + 90°)
A) -cos ϴ
B) -sin ϴ
C) cos ϴ
D) sin ϴ
Correct Answer:

Verified
Correct Answer:
Verified
Related Questions
Q68: Verify that each equation is an
Q69: Use a sum or difference identity
Q70: Decide whether the expression is or
Q71: Use the fundamental identities to simplify
Q72: Using a sum or difference identity,
Q74: Write the product as a sum
Q75: Determine all solutions of the equation
Q76: Use identities to find the indicated
Q77: Tell whether the statement is true
Q78: Use a sum or difference identity