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dar290
@dar290
July 2022
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вычислите значения выражений : sin 865 градусов, tg 31 пи деленое на 4, sin 11 пи деленое на 3 + cos 19 пи деленое на 6
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sharadi
Verified answer
Sin 865
° = Sin(90° * 9 + 55°) = Cos55°
tg 31
π/4 = tg(8π - π/4) = -tgπ/4= -1
Sin11
π/3
+ cos19
π/6=Sin(4π - π/3) + Cos(3π + π/6) =
= - Sinπ/3 - Cosπ/6 = -√3/2 -√3/2 = -√3
2 votes
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Answers & Comments
Verified answer
Sin 865° = Sin(90° * 9 + 55°) = Cos55°tg 31π/4 = tg(8π - π/4) = -tgπ/4= -1
Sin11π/3 + cos19π/6=Sin(4π - π/3) + Cos(3π + π/6) =
= - Sinπ/3 - Cosπ/6 = -√3/2 -√3/2 = -√3