Question

Вычислить: sin 10* sin 50 - cos 10* sin 40

Answer 1

sin10*sin50-cos10*sin40=100

Answer 2

sin10* sin(90*-40*)-cos10*sin40* = sin10* cos40* - cos10* sin40* = sin (10* - 40*) = sin (-30*) = -1/2