Вычислите:
[tex](cos18^0cos7^0 - sin18^0sin7^0)^2 + (sin19^0cos6^0 + cos19^0sin6^0)^2[/tex]
[tex](cos18^0cos7^0 - sin18^0sin7^0)^2 + (sin19^0cos6^0 + cos19^0sin6^0)^2[/tex]
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1.косинус суммы двух углов2.синус суммы двух углов