Question

Найдите значение выражения

Answer 1

=√2/4 *(sin35°sin80°+cos35°cos80°)/

(sin10°cos20°+cos10°sin20°)

√2/4 *(cos(80°-35°)/(sin(10°+20°)

=√2/4 *√2/2:(1/2)=√2/4 *√2=(√2)²/4=

2/4=1/2