The general solution of $a\cos x + b\sin x = c,$ where $a,\,\,b,\,\,c$ are constants

  • A

    $x = n\pi + {\cos ^{ - 1}}\left( {\frac{c}{{\sqrt {{a^2} + {b^2}} }}} \right)$

  • B

    $x = 2n\pi - {\tan ^{ - 1}}\left( {\frac{b}{a}} \right)$

  • C

    $x = 2n\pi - {\tan ^{ - 1}}\left( {\frac{b}{a}} \right) \pm {\cos ^{ - 1}}\left( {\frac{c}{{\sqrt {{a^2} + {b^2}} }}} \right)$

  • D

    $x = 2n\pi + {\tan ^{ - 1}}\left( {\frac{b}{a}} \right) \pm {\cos ^{ - 1}}\left( {\frac{c}{{\sqrt {{a^2} + {b^2}} }}} \right)$

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