Question

решите уровнение cos(x/2+π/4)+1=0

Answer 1

cos(x/2+π/4)+1=0
cos(x/2+π/4)=-1
x/2+π/4=π
x/2=π-π/4
x/2=3π/4
x=3π/2 + 2kπ, k∈Z
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(cosπ=-1)