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Mathematics 14 Online
OpenStudy (anonymous):

Please help! Precalc/Trig problem :/ Click attached

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?

OpenStudy (alexwee123):

yep

OpenStudy (anonymous):

Thank you! :)

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