Упростите:

[tex] \sqrt{1+cos2 \alpha/2 } +cos \alpha [/tex]

[tex]cos \pi /5+cos2 \pi /5+cos4 \pi /5+cos6 \pi /5[/tex]

Вычислите:

cos36*cos72

sin18*cos54

[tex] cos2 \pi /7+cos4 \pi /7+cos6 \pi /7[/tex]
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