$$\frac{{\sin \theta+ \cos \theta }}{{{\text{sin}}\theta- \cos \theta – McqOptions

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1.	$$\frac{{\sin \theta+ \cos \theta }}{{{\text{sin}}\theta- \cos \theta }} = 3,$$then the value of $${\sin ^4}\theta- {\text{co}}{{\text{s}}^4}\theta $$is?
A.	$\frac{1}{5}$$
B.	$\frac{3}{5}$$
C.	$\frac{2}{5}$$
D.	$\frac{4}{5}$$
Answer» C. $\frac{2}{5}$$

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