SIN(90*-0)COT(90*-0)/SIN0+COS(90-0)=1/2

SIN(90*-0)COT(90*-0)/SIN0+COS(90-0)=1/2

What is that supposed to be ?
The first thing I noticed is that you are dividing by
sin0, which is division by zero!

That makes everything else I see useless.

Is 0 supposed to stand for Ø ???
If so, then the following properties are true

sin(90-Ø) = cosØ
cot(90-Ø) = tanØ
cos(90-Ø)= sinØ

second concern:
is the division by sinØ or by (sinØ + cos(90-Ø) )
Use brackets to establish the correct order of operation