If cos2θ - sin2θ = $$\frac{1}{3}{\text{,}}$$ where 0 ≤ θ ≤ $$\f – McqOptions

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1.	If cos2θ - sin2θ = $$\frac{1}{3}{\text{,}}$$ where 0 ≤ θ ≤ $$\frac{\pi }{2}{\text{,}}$$ then the value of cos4θ - sin4θ is?
A.	$\frac{1}{3}$$
B.	$\frac{2}{3}$$
C.	$\frac{1}{9}$$
D.	$\frac{2}{9}$$
Answer» B. $\frac{2}{3}$$

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