Задача 61367 ...

618543b26af9d935d6393a94

05.11.2021 17:47:23

1 + cos(π/2 + x) + cos(x – π/2) при x = Pi/4

6162f85d8c4c5a5ade8bbb96

05.11.2021 18:43:47

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1 + cos(π/2 + x) + cos(x - π/2) = 1 - sinx + cos(-(π/2 - x)) = 1 - sinx + sinx = 1.