Question

(cos^2 π/6) - (sin^2 π/6)

Answer 1

$cos {}^{2} ( frac{pi}{6} ) - sin {}^{2} ( frac{pi}{6} ) = cos(2 times frac{pi}{6} ) = cos( frac{pi}{3} ) = frac{1}{2}$

Ответ: 0,5