psychocatgirl1
12.07.2019 •
Mathematics
Write an equation that could be used to find the value of a.
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Ответ:
see below
Step-by-step explanation:
The Law of Cosines tells you ...
a² = b² + c² -2bc·cos(A)
Substituting the given values gives you ...
a² = 4² +7² -2(4)(7)cos(52°)
Ответ: