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Formulae of trigonometry
\begin{aligned}
sin^2\theta + cos^2 \theta = 1 \\
1 + tan^2 \theta = sec^2 \theta \\
1 + cot^2 \theta = cosec^2 \theta \\
\end{aligned}
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\begin{aligned}
sin^2\theta + cos^2 \theta = 1 \\
1 + tan^2 \theta = sec^2 \theta \\
1 + cot^2 \theta = cosec^2 \theta \\
\end{aligned}
