Безумно сильно нужна помощь по Алгебре. Даю 20 баллов

cos([tex] \frac{2 \pi }{4} [/tex]) + cos([tex] \frac{ \pi }{2} [/tex]) + cos(-[tex] \frac{ \pi }{4} [/tex]) + cos([tex] 2\pi [/tex])
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