$$\frac{{\sin \theta + \cos \theta }}{{{\text{sin}}\theta

Question

$$\frac{{\sin \theta + \cos \theta }}{{{\text{sin}}\theta - \cos \theta }} = 3,$$ then the value of $${\sin ^4}\theta - {\text{co}}{{\text{s}}^4}\theta $$ is?

Options:

A . $$\frac{1}{5}$$

B . $$\frac{3}{5}$$

C . $$\frac{2}{5}$$

D . $$\frac{4}{5}$$

Answer: Option B

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