Question

1) 0.5 + sin^2 a + cos ^2 a
2) 2-sin^2 a - cos ^2 a​

Answer 1

Основное тригонометрическое тождество:

$fbox{sin^{2} alpha + cos^{2} : alpha= 1 }$

тогда:

$1. 0.5 + sin^{2}a + cos^{2}a = 0.5 + 1 = 1.5 \ 2. : 2 - sin^{2}a - cos^{2}a = 2 - (sin^{2}a + cos^{2}a) = 2 - 1 = 1$