Jawabanmu

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2014-05-31T15:18:54+07:00
SinA=1/2 akar 2
A=45
cosB=1/2
B=60
A+B+C=180
45+60+C=180
C=75
tan75=tan(30+45)
 \frac{tan30+tan45}{1-tan30.tan45}
\frac{ \frac{1}{ \sqrt{3} }+1 }{1- \frac{1}{ \sqrt{3} } }
= \frac{ \frac{1+ \sqrt{3} }{ \sqrt{3} } }{ \frac{ \sqrt{3}-1 }{3} }
= \frac{1+ \sqrt{3} }{ \sqrt{3}-1 } . \frac{ \sqrt{3}+1}{\sqrt{3}+1}

= \frac{4+ 2\sqrt{3} }{2} =2+1 \sqrt{3}

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