cos(π-(2/5)x)+sin((3π/2)-(2/5)x)=0

Cos(π-(2/5)x)+sin((3π/2)-(2/5)x)=0-Cos2/5 x -Cos2/5 x = 0-2Cos2/5 x = 0Cos2/5 x = 02/5 x = π/2 + πk , k ∈ Zx = 5π/4 + 5πk/2 , k ∈Z