If cos20° = m and cos70° =n, then the value of m2 + n2 is? Options: A . &nbsp$$\frac{1}{2}$$ B . &nbsp1 C . &nbsp$$\frac{3}{2}$$ D . &nbsp$$\frac{1}{{\sqrt 2 }}$$

If cos20° = m and cos70° =n, then the value of m2 + n2 is?

Question - If cos20° = m and cos70° =n, then the value of m2 + n2 is?

Options:

A . $$\frac{1}{2}$$

B . 1

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

D . $$\frac{1}{{\sqrt 2 }}$$

Answer: Option B

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