Question 763671
domain: [0,π/2]
(cos x-sqrt of2/2)(sec x-1)=0
{{{(cos(x)-sqrt(2)/2)(sec(x)-1)=0}}}
cosx-√2/2=0
cosx=√2/2
x=π/4 or 45º
..
secx-1=0
secx=1
1/cosx=1
cosx=1
x=0