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

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