Question 747131
What are the x's of: ((sin^2)x) +(cos)x) +1)) = 0
{{{sin^2(x)+cos(x)+1=0}}}
{{{1-cos^2(x)+cos(x)+1=0}}}
{{{-cos^2(x)+cos(x)+2=0}}}
{{{cos^2(x)-cos(x)-2=0}}}
(cos(x)-2)(cos(x)+1)=0
cos(x)=2 (reject,(-1 ≤ cosx ≤ 1)
cos(x)=-1
x=π