sin a = ± = ± = ± = ± = ± = ± = ±
tg a = = ± : (- 0,4) = ± · = ±
ctg a = = 1 : (± ) = 1 · (± ) = ±
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sin a = ± = ± = ± = ± = ± = ± = ±
tg a = = ± : (- 0,4) = ± · = ±
ctg a = = 1 : (± ) = 1 · (± ) = ±