\((\sin^4 x - \cos^4 x - 1)(\tan^2 x + \cot^2 x + 2)\). \(3(\sin^8 x - \cos^8 x) + 4(\cos^6 x - 2\sin^6 x) + 6\sin^4 x\) . \(\sin^4 x(1 + \sin^2 x) + \cos^4 x(1 + \cos^2 x) + 5\sin^2 x \cos^2 x\). \(2(\sin^4 x + \cos^4 x + \sin^2 x \cos^2 x)^2 - (\sin^8 x + \cos^8 x)\)

Chứng minh các biểu thức không phụ thục vào x giúp mình ạ 

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(g) \((\sin^4 x - \cos^4 x - 1)(\tan^2 x + \cot^2 x + 2)\)

(h) \(3(\sin^8 x - \cos^8 x) + 4(\cos^6 x - 2\sin^6 x) + 6\sin^4 x\)

(i) \(\sin^4 x(1 + \sin^2 x) + \cos^4 x(1 + \cos^2 x) + 5\sin^2 x \cos^2 x\)

(j) \(2(\sin^4 x + \cos^4 x + \sin^2 x \cos^2 x)^2 - (\sin^8 x + \cos^8 x)\)