Вычислите: cos^2(150)-(sin70cos40-cos70cos50)^2
p.s. все значения в скобках указанны в градусах
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Cos^2(90+60)-(sin70cos40-cos70cos(90-40))^2=3/4-(sin70cos40-cos70sin40)^2=3/4-1/4=1/2