What are the $3$ trigonometric identities?

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Solution

Define trigonometric identities.
Three important trigonometric identities are
$\sin^{2} (θ) + \cos^{2} (θ) = 1$
$1 + \tan^{2} (θ) = \sec^{2} (θ)$
$\csc^{2} (θ) = 1 + \cot^{2} (θ)$

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