Vienetinis apskritimas ir trigonometrinės funkcijos bet kokiam kampui
Pagal 9–10 kl. BP mokomasi apibrėžti sin, cos, tg per vienetinį apskritimą, nagrinėti posūkio kampą, nustatyti ženklus ketvirčiuose ir rasti reikšmes žinomiems kampams.
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