Question

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

Answer 1

cos²67° - sin² 23°

sin²(90-67)° - sin²23° [cos²67=sin²(90-67)]

sin²23° - sin² 23°

=0

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Answer 2

$\bold{hope\: this\: pic \:helps \:uhh....}$

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