Cot^3t/csct = cost(csc^2t-1)
We have to try to verify the identity -- \(\dfrac{Cot^3t}{csct} = cost(csc^2t-1)\) \(cost(csc^2t - 1)\) \(cost(cot^2t)\) \(cost( \dfrac{cos^2t}{sin^2t} )\) \(\dfrac{cos^3t}{sin^2t}\) \(sin^2t eq csct\)