value cos^2(180/6+x)-sin^2(180/6-x)
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Cos^2 (30+x)-sin^2 (30-x)
= cos(30+x+30-x)cos(30+x-30+x)
= cos(60)cos(2x)
= cos(2x)/2
= cos(30+x+30-x)cos(30+x-30+x)
= cos(60)cos(2x)
= cos(2x)/2
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