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2014-05-06T17:45:57+03:00
A) tgB=AB/AC
2=AB/6⇒AB=12
BC²=AB²+AC²
BC²=144+36
BC=√180
BC=6√5
sinC=AB/BC
sinC=12/6√5=2√5/5
b) 
sinB=AC/BC
12/13=AC/13
AC=12
AB²=BC²-AC²
AB²=169-144
AB=√25
AB=5
tgC=AB/AC
tgC=5/12
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