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Choose the expression equivalent to the following:

$$\cfrac{\sin^6θ+\cos^6θ}{\sin^4θ-\sin^2θ\cos^2θ+\cos^4θ}$$

A

$1$

B

$-\csc^2θ\sec^2θ$

C

$\cfrac{1}{1-\sin^2θ\cos^2θ}$

D

$\sin^4θ$

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