The value of the expression $({tan}^{2} x + 1) ({cos}^{2} x + 1) - {tan}^{2} x$ is

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Solution

$({tan}^{2} x + 1) ({cos}^{2} x + 1) - {tan}^{2} x = {sin}^{2} x + {tan}^{2} x + {cos}^{2} x + 1 - {tan}^{2} x = 2$

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