Question 948292
Add 4 to both sides.
{{{cos(x)=sin(x)}}}
{{{tan(x)=1}}}
{{{x=45}}} and {{{x=225}}}
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If the problem was 
{{{cos(x-4)=sin(x-4)}}}
Then,
{{{tan(x-4)=1}}}
{{{x-4=45}}} and {{{x-4=225}}}
{{{x=49}}} and {{{x=229}}}