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OpenStudy (anonymous):
HELP! simplify: cos(180° + x) + cos(180° - x)
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OpenStudy (sidsiddhartha):
cos(180° + x)=-cosx cos(180° - x)=-cosx so cos(180° + x) + cos(180° - x)=-2cosx
OpenStudy (anonymous):
perfect can you also help with this one? cos(126°)cos(36°) + sin(126°)sin(36°)
OpenStudy (sidsiddhartha):
use cos(A-B)=cosAcosB+sinAsinB
OpenStudy (anonymous):
i know im just not sure how!
OpenStudy (sidsiddhartha):
just using the formula-- cos(126°)cos(36°) + sin(126°)sin(36°)=cos(126-36)=cos90=0
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OpenStudy (anonymous):
thank yoU!
OpenStudy (sidsiddhartha):
yw!!
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