cos(α+β)=54sin(α−β)=135tan2α=tan(α+β+α−β)=1−4312543+125=3356⇒tan(α+β)=43⇒tan(α−β)=125
Let cos(α+β)=54 and let sin(α−β)=135, where 0≤α,β≤4π, then tan2α=
Held on 30 Apr 2010 · Verified 6 Jul 2026.
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