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

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1. \(\cos^2 α\) \(=\)

\(1 + \sin^2 α\)
\(1 + \sin α\)
\(1 - \sin^2 α\)
\(1 - \sin α\)

2. \(\tan α\) \(=\)

\(\sqrt{\sec α - 1}\)
\(\sqrt{\sec^2 α - 1}\)
\(\sqrt{\cot^2 α - 1}\)
\(\sqrt{\cot α - 1}\)

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