Question

sin (-30⁰)+cos (-60⁰)- 2tg (-30⁰) •ctg (-60⁰),​

Answer 1

Ответ:

sin(-30⁰) + cos(-60⁰) - 2 tan(-30⁰) cot(-60⁰)

= -sin(30⁰) + cos(60⁰) - 2(-tan(30⁰))(-cot(60⁰))

= -1/2 + 1/2 - 2(√3/3)(2/√3)

= -1/2 + 1/2 - 4/3

= -1/3