x∈(0,π/2)
sinx < x
∫ (0->π/2) sinx/x dx < ∫ (0->π/2) dx = π/2
x∈(0,π/2)
sinx/x >0
∫ (0->π/2) sinx/x dx >0
ie
0π/2) sinx/x dx < π/2
x∈(0,π/2)
sinx < x
∫ (0->π/2) sinx/x dx < ∫ (0->π/2) dx = π/2
x∈(0,π/2)
sinx/x >0
∫ (0->π/2) sinx/x dx >0
ie
0π/2) sinx/x dx < π/2