(sin 5п/18+sin 11п/9)/(cos 5п/18+cos 11п/9)

Question

(sin 5п/18+sin 11п/9)/(cos 5п/18+cos 11п/9)

Answer 1

(sin 5п/18+sin 11п/9)/(cos 5п/18+cos 11п/9)=

= (2sin27pi/36 * cos17pi/36)/(2cos27pi/36 * cos17pi/36) = tg3pi/4 = -1

Ответ: -1