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So, you've memorized your fundamental identities, but how can you prove the more obscure ones? See how to apply the basic building blocks of trig to understand deeper relationships.

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Which of the following expressions is equal to \[ \tan{\theta} \sin{\theta} + \cos{\theta} ? \]

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Which of the following expressions is equal to \[ \tan^2{\theta} + \cot^2{\theta} ? \]

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Which of the following is equal to \(\sin 2x?\)

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Which of the following expressions is equal to \[ \tan^2{\theta} - \sin^2{\theta} ? \]

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