Question

решите...............

Answer 1

task/25736559
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cos(5x+3) = - 5/8 ;
5x+3= ± (π -arccos(5/8) ) +2πk , k ∈ ℤ ;
x =  -3/5± (1/5)*(π -arccos(5/8) ) +2πk/5 , k ∈ ℤ 

Answer 2

а почему cos(5x=3)= -5/8 ?