[cot(θ+4π)·cos(θ+π)·sin^2(θ+3π)]/[tan(π+θ)·cos^3(-π-θ)]如题,望尽快予以解答

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[cot(θ+4π)·cos(θ+π)·sin^2(θ+3π)]/[tan(π+θ)·cos^3(-π-θ)]如题,望尽快予以解答
[cot(θ+4π)·cos(θ+π)·sin^2(θ+3π)]/[tan(π+θ)·cos^3(-π-θ)]
如题,望尽快予以解答

[cot(θ+4π)·cos(θ+π)·sin^2(θ+3π)]/[tan(π+θ)·cos^3(-π-θ)]如题,望尽快予以解答
[cot(θ+4π)·cos(θ+π)·sin^2(θ+3π)]/[tan(π+θ)·cos^3(-π-θ)]
=[cotθ(-cosθsin²θ]/(tanθcos³θ)
=-[(cosθ/sinθ)sin²θ]/[(sinθ/cosθ)cos²θ]
=-sinθcosθ/sinθcosθ
=-1