已知函数f(x)=2sin(1/3x-π/6)(1)求f(5π/4) (2)设α,β∈[0,π/2],f(3α+π/2)=10/13,f(3β+π/2)=6/5.求cos(α+β)的值.
问题描述:
已知函数f(x)=2sin(1/3x-π/6)
(1)求f(5π/4)
(2)设α,β∈[0,π/2],f(3α+π/2)=10/13,f(3β+π/2)=6/5.求cos(α+β)的值.
答