Question

sin x = -1

cos x = -1

sin 3x=0

cos 0,5x=0

cos(5x+4n)=1

Answer 1

sinx=-1;

x=-π/2+2πn. n∈Z.

 

cosx=-1;

x=π+2πn. n∈Z.

 

sin3x=0;

3x=πn. n∈Z.

x=πn/3. n∈Z.

 

cos(x/2)=0;

x/2=π/2+πn. n∈Z.

x=π+2πn. n∈Z.

 

 

cos(5x+4π)=1;

cos5x=1;

5x=2πn. n∈Z.

x=2πn/5. n∈Z.