document.write( "Question 467068: f(x)=2sin(1/3x-1/6π)，x∈R,α,β∈[0,π/2],f(3α+π/2)=10/13,f(3β+2π)=6/5,please work out cos(α+β) \n" ); document.write( "

Algebra.Com's Answer #320345 by Big Poop(157) $\"\"$ $\"About$

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