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including olympiad champions, researchers, and professionals.

examples, and problems from the community.

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These are your basic building blocks for solving trigonometric equations and understanding how the pieces fit together. Using these identities can make sense of even the scariest looking trig.

Which of the following is equal to

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

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by **Brilliant Staff**

Which of the following is equal to

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

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by **Brilliant Staff**

Which of the following is equal to

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

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by **Brilliant Staff**

Which of the following is equal to

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

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by **Brilliant Staff**

Which of the following is equal to

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

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by **Brilliant Staff**

© Brilliant 2017

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