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OpenStudy (anonymous):
Please help! Precalc/Trig problem :/ Click attached
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OpenStudy (anonymous):
OpenStudy (alexwee123):
use law of cosines
OpenStudy (alexwee123):
a2=b2+c2- 2bccosA
OpenStudy (alexwee123):
12^2=15^2+18^2-2(15)(18)cos(A) can you solve it by yourself now?
OpenStudy (anonymous):
Yes, but I need to make sure, it's the first option, right?
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OpenStudy (alexwee123):
yep
OpenStudy (anonymous):
Thank you! :)
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