Question

помогите плиз.Тригонометрия

Answer 1

$frac{cos( - frac{pi}{12} ) - cos frac{3pi}{4} }{sin frac{pi}{12} - sin frac{5pi}{4} } = frac{cos frac{pi}{12} - cos(pi - frac{pi}{4} )}{sin frac{pi}{12} - sin(pi + frac{pi}{4}) } = frac{cos frac{pi}{12} + cos frac{pi}{4} }{sin frac{pi}{12} + sin frac{pi}{4} } = frac{2cos( frac{ frac{pi}{12} + frac{pi}{4} }{2})cos( frac{ frac{pi}{12} - frac{pi}{4} }{2} ) }{2sin( frac{ frac{pi}{12} + frac{pi}{4} }{2} )cos( frac{ frac{pi}{12} - frac{pi}{4} }{2}) } = frac{cos( frac{frac{4pi}{12}}{2} )}{sin( frac{ frac{4pi}{12} }{2} ) } = frac{cos( frac{pi}{6} )}{sin( frac{pi}{6}) } = ctg frac{pi}{6} = sqrt{3}$

Answer 2

Исправлер

Answer 3

Исправлено*

Answer 4

Хотя, нет

Answer 5

Все, точно исправлено.

Answer 6

Спасибо