Could you complete your question? An equation should have both sides separated by the "equal" sign unless the task is merely to simplfy this expression. But even in this case your posted expression lacks correct arrangement: (csc((cot(180-x)-tan(x))/(sec(90+x)* sec( cos, sin,tan, cot,...???)(90+x))
Simplification:
[csc((cot(180-x)-tan(x))/(sec(90+x)*sec(90+x)] = 1/[sin((cot(180-x)-tan(x)) : 1/(cos(90+x))^2)]= 1/[sin((-cot(x) - tan(x)): 1/(-sin x)^2)] = 1/[sin(-(cot(x) + tan(x))*(sin x)^2)] =
= 1/[sin(-(cos x / sin x + sin x / cos x)*(sin x)^2)] = 1/[sin(-((cos x)^2 + (sin x)^2) / sin x cos x )*(sin x)^2)] = 1/[sin(-1 / sin x cos x )*(sin x)^2)] = we got smth sharmless and mindless which bears witness that here cannot be sec(90 + a)*sec(90 + a). So specifize it, please.
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