Trigonometric identity — task. Mathematics State Board, Class 10.

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1. \(\sin^2 A\) \(=\)

\(1 - \cos A\)
\(1 - \cos^2 A\)
\(1 + \cos^2 A\)
\(1 + \cos A\)

2. \(\cot^2 A\) \(=\)

\(\tan^2 \: A - 1\)
\(\text{cosec} \: A - 1\)
\(\tan^2 \: A + 1\)
\(\text{cosec}^2\: A - 1\)

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