[Frank Munga]

Hi Guys

Just wondering if anyone can differentiate these equations, for underground pressure on a cylinder.

-2/π ʃₒⁿ cosβ ʃₒᵝ q sin(β-α)dα dβ………equation-1

rR -1/π ʃₒⁿ ʃₒᵝ qrsin(β-α)dα dβ…………equation-2

q and r are constants so the only thing needing differentiating is ʃₒᵝ sin(β-α)dα dβ

I get this

sin(β-α) = sin(β) x cos(α) – cos(β) x sin(α)

ʃ f(β-α)dx = -sin(β) x sin(α) – cos(β) x cos(α)

Is it right ….that is the question….?

[Frank Munga]

cos(β-α)

Someone on the maths forum solved it for me.

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