Question 1119780
Start with the definitions of those functions, substitute, and then simplify.













{{{(sin(x)/cos(x))/(1/sin(x))+sin(x)/(sin(x)/cos(x))}}}


{{{(sin(x)/cos(x))*sin(x)+sin(x)(cos(x)/sin(x))}}}


{{{highlight_green(sin^2(x)/cos(x)+cos(x))}}}

OR you could continue:


{{{sin^2(x)/cos(x)+cos^2(x)/cos(x)}}}


{{{(sin^2(x)+cos^2(x))/cos(x)}}}


{{{highlight_green(1/cos(x))}}}