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