Mathematics
Senior High
Solved
要怎麼算呢
已知△ABC中,AB=5,BC=7,AC=4,試問:
1
(1)cos4=【
5】。(10分)
(2)△ABC的面積為【
456 】平方單位。(15分)
5
A
4
COS A 2
a² = b²+ c²- cosa
2
6²+C²- c² x co
26C
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