LAtex Codes Please Help

Why is it coming almost half the time that – ” Formula Does not Parse”
cananyone find the mistake in this latex code? –
$latex xy + yz + zx \ge a^2 + b^2 + c^2$
it is coming correct in the preview screen but when i update that “Formula….” message is coming.
What happened? is my code wrong?
The blog I need help with is mathematicaldreams.wordpress.com.
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