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Use of Trigonometric Table

Evaluate co...

Question

Evaluate $c o s^{2} (67) - s i n^{2} (23)$

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Solution

${cos}^{2} (67) - {sin}^{2} (23)$
$= {cos}^{2} (67) - {cos}^{2} (90 - 23)$
$= {cos}^{2} 67 - {cos}^{2} 67 = 0$

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