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• \(-1\)
• \(0\)
• \(1\)
• \(\sin t\)
• \(\cos t\)
• \(\tg t\)
• \(\ctg t\)

\(\textcolor{white}{\boxed{\textcolor{black}{\sin^2(-t)-\dfrac{\cos^2 t}{\ctg (-t) \cdot \tg t}=}}}\)
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\(\textcolor{white}{\boxed{\textcolor{black}{\tg t \left(-1+\dfrac{1}{\sin^2 t}\right)=}}}\)
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