ok another one.
i've gotten the left side down to
cos(x/2) - sin(x/2)
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cos(x/2) + sin(x/2)
and the final right side equals:
1 - tan(x/2)
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1 + tan(x/2)
please help...
ps. i'm sorry for making it look so noobish. I am not sure how you guys do that fancy way of writing the equation down. The way Galactus over there answered me.