$\cos^2 10^o - \cos 10^o \cos 50^o + \cos^2 50^o$ का मान क्या है?

  • A
    $\frac{3}{2}(1 + \cos 20^o)$
  • B
    $\frac{3}{4}$
  • C
    $\frac{3}{2}$
  • D
    $\frac{3}{4} + \cos 20^o$

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