tg(45 - a/4) = (tg(45) - tg(a/4))/(1 + tg(45)*tg(a/4)) = (1 - tg(a/4)) / (1 + tg(a/4))
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tg(45 - a/4) = (tg(45) - tg(a/4))/(1 + tg(45)*tg(a/4)) = (1 - tg(a/4)) / (1 + tg(a/4))