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$\frac{\sin^{3} θ - \cos^{3} θ}{\sin θ - \cos θ} - \frac{\cos θ}{\sqrt{1 + \cot^{2} θ}} - 2 \tan θcot θ = - 1$ if

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sin3⁡θ−cos3⁡θsin⁡θ−cos⁡θ−cos⁡θ1+cot2⁡θ−2tan⁡θcot⁡θ=−1 if

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$\frac{\sin^{3} θ - \cos^{3} θ}{\sin θ - \cos θ} - \frac{\cos θ}{\sqrt{1 + \cot^{2} θ}} - 2 \tan θcot θ = - 1$ if