Find the value of ${cos}^{2} 17^{0} - {sin}^{2} 73^{0}$ .

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Solution

$sin 73^{0} = sin (90^{0} - 17^{0}) = cos 17^{0}$
$∴ {cos}^{2} 17^{0} = {sin}^{2} 73^{0}$
$= {cos}^{2} 17^{0} - {cos}^{2} 17^{0} = 0$

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