ધારો કે $\triangle ACB$ એ $C$ આગળ કાટખૂણો ધરાવતો ત્રિકોણ છે. જો $AB = 29$ એકમ,$BC = 21$ એકમ અને $\angle ABC = \theta$ હોય,તો $\cos^2 \theta - \sin^2 \theta = $

  • A
    $1$
  • B
    $\frac{41}{841}$
  • C
    $\frac{40}{441}$
  • D
    $\frac{41}{800}$

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