Объяснение:
Sin105⁰Cos15⁰ + Sin15⁰Sin165⁰ + tg(-225⁰) = Sin(90⁰ + 15⁰)Cos15⁰ +
+ Sin15⁰Sin(180⁰ - 15⁰) - tg(180⁰ + 45⁰) = Cos15⁰Cos15⁰ + Sin15⁰Sin15⁰ - tg45⁰ =
= (Cos²15⁰ + Sin²15⁰) - tg45⁰ = 1 - 1 = 0
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Объяснение:
Sin105⁰Cos15⁰ + Sin15⁰Sin165⁰ + tg(-225⁰) = Sin(90⁰ + 15⁰)Cos15⁰ +
+ Sin15⁰Sin(180⁰ - 15⁰) - tg(180⁰ + 45⁰) = Cos15⁰Cos15⁰ + Sin15⁰Sin15⁰ - tg45⁰ =
= (Cos²15⁰ + Sin²15⁰) - tg45⁰ = 1 - 1 = 0