Practice - Basic identities
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Practice Questions
Test your understanding with targeted questions
What is the value of cos(30°)?
💡 Hint: Use the Pythagorean identity.
Write the Pythagorean identity.
💡 Hint: Think about the relationships in a right triangle.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the Pythagorean identity?
💡 Hint: Recall the fundamental Pythagorean theorem.
True or False: If sin(A) is 0.5, then cos(A) can be found with the formula cos(A) = √(1 - sin²A).
💡 Hint: Consider how sine and cosine relate to each other.
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Challenge Problems
Push your limits with advanced challenges
A right triangle has an angle A where sin(A) = 0.4. Find cos(A) and tan(A).
💡 Hint: Use the Pythagorean identity to find cos first.
Show that if tan(A) = 3/4, then sin(A) and cos(A) can be derived from these identities.
💡 Hint: Draw a right triangle and relate the sides to sine and cosine.
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Reference links
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