Solve ${cos}^{2} 17 - {sin}^{2} 73 =$ ____

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Solution

The correct option is A $0$
Let,
$c o s^{2} 17 - s i n^{2} 73$
$= c o s^{2} 17 - s i n (90 - 17)^{2}$
$= c o s^{2} 17 - c o s^{2} 17 = 0$

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