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OpenStudy (aravindg):
acos(θ)+bsin(θ)=c prove that cos(α+β)=a2−b2a2+b2
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OpenStudy (aravindg):
prove that cos(α+β)=a2−b2/a2+b2
OpenStudy (aravindg):
estudier plz help in another question ig ot answer of this one
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