Ответ:
1
Объяснение:
1 + cos(2α) - sin(2α) / cos(α) + cos(π/2+α) = 2cos(α)^2 - 2cos(α)sin(α) / cos(α) - cos(π-π/2-α) = 2cos(α) (cos(α)-sin(α))/cos(α) - cos(π/2 -α) = 2cos(α) (cos(α)-sin(α))/cos(α)-sin(α) =2cos(α) = 2cos(2π + π/3) = 2cos(π/3) =1
4/10 * 1/3 = 4/30
5/6 * 12/10 = 60/60 = 1
4/30 / 1 = 4/30 = 2/15
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25/10 = 5/2
5/2 * 4/5= 20/10 = 2
16/10 = 8/5
8/5 * 3/4 = 24/20 = 6/5
2 / 6/5 = 2 * 5/6 = 10/6 = 5/3
S(n)=2a1+d(n-1)/2*84;
S84=(-0,64-16,6)*42=-670,32.
cos(4a)+4cos(2a)+3=cos^2(2a) - sin^2(2a)+4cos(2a)+3