Sina=-12/13 ⇒ cosa=√1-sin²a⇒cosa=√1-144-169=√25/169=5/13
tg²a+1=1/cosa⇒...=5/12
ctga=12/5
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Sina=-12/13 ⇒ cosa=√1-sin²a⇒cosa=√1-144-169=√25/169=5/13
tg²a+1=1/cosa⇒...=5/12
ctga=12/5