Question

поможете сделать 5,6,7

Answer 1

5. 2sinx/2=-√2
sinx/2=-√2/2
x/2=(-1)^(n+1) π/4+πn
x=(-1)^(n+1) π/2+2πn
6. cos6x=-1
6x=π+2πn
x=π/6+πn/3
7. sin(π/6-x)=1/2
π/6-x=(-1)^n π/6+πn
-x=(-1)^n π/6-π/6+πn
x=(-1)^(n+1) π/6+π/6+πn