यदि $\cos (A-B)=3/5$ और $\tan A \tan B=2$ है,तो निम्नलिखित में से कौन सा सत्य है?

  • A
    $\sin (A+B)=1/5$
  • B
    $\sin (A+B)=-1/5$
  • C
    $\cos (A-B)=1/5$
  • D
    $\cos (A+B)=-1/5$

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