Mathematics
Senior High
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18になる過程の途中式を知りたいです!
245 余弦定理により
a²=(2√3)2+(3-√√3) 2-2-2√3(3-√3) cos 120°
=12+ (9-6√3+3)-4√3(3-√√3)x(-)=18
2
a > 0 であるから
a=√18=3√2
余弦定理により
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