Question

cos (П + х/2) = 0

sin (П/2 + x) = 1

cos (П/3 - x) = кор. из 2/2

Answer 1

cos(π+x/2)  =0 ;
π+x/2 =π/2+π*k , k∈ Z.
x/2 = - π/2 +π*k;
x= -π+2π*k;
x=(2k -1)π;  нечетное число π
================
sin(π/2+x) =1;
π/2+x =π/2 +2π*k;
x =2k*π. четное число π
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cos(π/3 -x) =√2/2;
cos(x-π/3) =√2/2;( cos  четная фунлция)
x-π/3 =(+/-)π/4 +2π*
x₁= π/3+(+/-)π/4 +2π*k;
или
x₁ = 7π/12+2π*k;
x₂  = π/12+2π*k;