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denizmutavasim843
@denizmutavasim843
October 2023
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ПОМОГИТЕ ПОЖАЛУЙСТА!!! 60 баллов!!
Дано:
cos a = - 3/5 ; π/2 < a > 3π/4
[tex] - \frac{3}{5} \: \frac{\pi}{2} < \alpha < \frac{3\pi}{4} [/tex]
Найти: а) cos ∞/2 ; б) cos 2a
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