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Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 7 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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Fundamental Trigonometric Identities

Concept Quizzes

Ratio of Trigonometric Functions
Even-Odd Functions
Periodicity Identities
Co-Function Identities
R Method
Problem Solving

Challenge Quizzes

Level 2
Level 3
Level 4

Trigonometric Even-Odd Functions

Which of the following is equal to

\[ \sin ( - \theta) ? \]

\( -\sin \theta \) \( \cos \theta \) \( \sin \theta \) \( -\cos \theta \)

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by Brilliant Staff

Which of the following is equal to

\[ \sec ( - \theta) ? \]

\( -\sec \theta \) \( \sec \theta \) \( \csc \theta \) \( -\csc \theta \)

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by Brilliant Staff

Which of the following is equal to

\[ \cot ( - \theta) ? \]

\( \cot \theta \) \( -\tan \theta \) \( \tan \theta \) \( -\cot \theta \)

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by Brilliant Staff

Which of the following is equal to

\[ \csc ( - \theta) ? \]

\( \sec \theta \) \( -\sec \theta \) \( -\csc \theta \) \( \csc \theta \)

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by Brilliant Staff

Which of the following is equal to

\[ \tan ( - \theta) ? \]

\( \tan \theta \) \( -\cot \theta \) \( \cot \theta \) \( -\tan \theta \)

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by Brilliant Staff

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