Practice - Co-Function and Negative Angle Identities
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Practice Questions
Test your understanding with targeted questions
What is sin(90° − θ)?
💡 Hint: Think about the relationship between sine and cosine.
What happens to cos when the angle is negative?
💡 Hint: Is cosine even or odd?
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the value of sin(90° - θ)?
💡 Hint: Consider how sine and cosine relate.
True or False: cos(-θ) = -cos(θ).
💡 Hint: Is cosine odd or even?
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Challenge Problems
Push your limits with advanced challenges
Prove that sin(90° - θ) = cos(θ) by using the definitions of the sine and cosine functions.
💡 Hint: Draw a right triangle and label the sides with respect to angle θ.
If sin(30°) = 1/2, find cos(60°) and verify via co-function identity.
💡 Hint: Consider how complementary angles relate.
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