Question

2. Спростіть вираз 3 sin2 a + 3 cos2 a.

Answer 1

$3 \sin {}^{2} ( \alpha ) + 3 \cos {}^{2} ( \alpha ) = \\ 3( \sin {}^{2} ( \alpha ) +\cos {}^{2} ( \alpha ) ) = 3 \times 1 = 3$