maryamahmed914 maryamahmed914
  • 04-06-2022
  • Mathematics
contestada

(a) If cos² (34°) - sin² (34°) = cos(A°),then
A =
degree’s

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loneguy
loneguy loneguy
  • 04-06-2022

[tex]~~~~~~~\cos^2 \left(34^{\circ}\right) - \sin^2 \left( 34^{\circ} \right)=\cos A\\\\\implies \cos \left( 2 \cdot 34^{\circ} \right) = \cos A~~~~~~~~~~~~~;[\cos 2x = \cos^2 x -\sin^2 x]\\\\\implies \cos \left(68^{\circ}\right) = \cos A\\\\\implies A = 68^{\circ}[/tex]

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