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David151
@David151
July 2022
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sin^2a+sin^2b+cos (a+b) cos (a-b) упростите выражение
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daynVassya
Sin^2a + sin^2b + cos(a + b)*cos(a - b) = sin^2a + sin^2b + cos^2a - sin^2b = sin^2a + cos^2a = 1.
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