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x ∈ (0;π/4)
cos 2x = 1/3
sin x = ?


Răspuns :

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


sin(x)=2π 
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Vezi imaginea SAMSUNGGENIUS200
Vezi imaginea SAMSUNGGENIUS200