यदि $\frac{a}{b} \tan x > -1$ है,तो $\tan ^{-1}\left[\frac{a \cos x-b \sin x}{b \cos x+a \sin x}\right]$ को सरल कीजिए।

  • A
    $\tan ^{-1} \frac{b}{a}+x$
  • B
    $\tan ^{-1} \frac{b}{a}-x$
  • C
    $\tan ^{-1} \frac{a}{b}-x$
  • D
    $\tan ^{-1} \frac{a}{b}+x$

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