Cursul.28 - Lectia.6 - Trigonometrie (Clas.9-12)

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"Trigonometia seen not as a set of formulas, but as we understand it myself when I was a student in grade-10th. Upset for proper teacher that I throw on some formula sheets, I grabbed a pen and they I deduce everything. NOT BE memory, but you must learn to ascribe. Watch film series from trigonometry and you will surely succeed! "
Professor Ioan Ursu from Romania.

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