Question 748452
What are the x's of: (2(cos^2)x)+(3(cos x))=0
{{{2cos^2(x)+3cos(x)=0}}}
divide by cos(x)
{{{2cos(x)+3=0}}}
2cos(x)=-3
cos(x)=-3/2
no solution: (-1 ≤ cosx ≤ 1)