Решите уравнение

Question

Решите уравнение

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Answer 1

Cos(5pi/3)^(5x-3)=k2(8)
cos(2pi-pi/3)^(5x-3)=cos(pi/3)^(5x-3)=(1/2)^(5x-3)=2^(3-5x)
k2(8)=k2(2^3)=2^3/2
3-5x=3/2
5x=3/2
x=3/10