Задача 61695 ...

61950c99c276aa24f4a0185c

21.11.2021 19:26:37

cos²(7π+x)=1/2

5f3ea7e3faf909182968ddd9

21.11.2021 21:06:30

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cos²(7π+x)=1/2

cos(7π+x)=-sqrt(2)/2 или cos(7π+x)=sqrt(2)/2

(7π+x)= ± arccos(-sqrt(2)/2)+2πk, k ∈ [b]Z[/b] или (7π+x)= ± arccos(sqrt(2)/2) +2πn, n ∈ [b]Z[/b]

(7π+x)= ±(π - arccos(sqrt(2)/2))+2πk, k ∈ [b]Z[/b] или (7π+x)= ± (π/4) +2πn, n ∈ [b]Z[/b]

(7π+x)= ±(π - (π/4))+2πk, k ∈ [b]Z[/b] или (7π+x)= ± (π/4) +2πn, n ∈ [b]Z[/b]

(7π+x)= ±(3π/4))+2πk, k ∈ [b]Z[/b] или (7π+x)= ± (π/4) +2πn, n ∈ [b]Z[/b]


x= ±(3π/4))-7π+2πk, k ∈ [b]Z[/b] или x= ± (π/4)-7π +2πn, n ∈ [b]Z[/b]