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In triunghiul ABC dreptunghic in A, Ac=5cm , Ab=5√2 cm atunci sin B =....? ctg C....?

Răspuns :

BC=√[(5√2)²+5²]=5√3
sin B=AC/BC=5/53=1/3=√3/3
ctg C=AC/AB=5/5
√2=1/2=2/2