Trigonometric identity — task. Mathematics CBSE, Class 10.

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1. \(\sin α\) \(=\)

\(\sqrt{1 + \cos α}\)
\(\sqrt{1 + \cos^2 α}\)
\(\sqrt{1 - \cos α}\)
\(\sqrt{1 - \cos^2 α}\)

2. \(\cot α\) \(=\)

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

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