If $${\text{co}}{{\text{s}}^4}\theta - {\sin ^4}\theta = \frac{2}{3}{\text{,}}$$

Question

If $${\text{co}}{{\text{s}}^4}\theta - {\sin ^4}\theta = \frac{2}{3}{\text{,}}$$ then the value of $${\text{2co}}{{\text{s}}^2}\theta - 1$$ is?

Options:

A . 0

B . 1

C . $$\frac{2}{3}$$

D . $$\frac{3}{2}$$

Answer: Option C

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