25 БАЛЛОВ, помогите с математикой

Question

25 БАЛЛОВ, помогите с математикой

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Answer 1

2x-π/2=π/6+πn
2x=π/6+π/2+πn

2x=4π/6+πn

2x=2π/3+πn
x=π/3+πn/2

4) 2sin (π+3/4x-3π/2+3/4 x) /2  *cos ( π+3/4x+3π/2-3/4x)/2 =0

2sin( -π/2+6/4x) /2 * cos(5π/2)=0

sin(-π/2+6/4x)=0

-π/2+6/4x=πn
6/4x=π/2+πn

x=π/2*4/6 + 4πn/6
x=π/3+ 2πn/3