Question 386440
{{{4*sin^2(x)-(4/csc(x))+cos(x)*sec(x)=0}}}
{{{4*sin^2(x)-4*sin(x)+cos(x)*(1/cos(x))=0}}}
{{{4*sin^2(x)-4*sin(x)+1=0}}}
Let {{{u=sin(x)}}},
{{{4u^2-4u+1=0}}}
{{{(2u-1)^2=0}}}
One solution:
{{{2u-1=0}}}
{{{2u=1}}}
{{{u=1/2}}}
{{{sin(x)=1/2}}}
{{{x=30}}}degrees and {{{x=150}}}degrees