Ответ:
[tex]cos(45 ^{ 0 } + {15}^{0} ) = \cos(60 ^{0} ) = \frac{1}{2} [/tex]
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Ответ:
[tex]cos(45 ^{ 0 } + {15}^{0} ) = \cos(60 ^{0} ) = \frac{1}{2} [/tex]