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यदि `sin theta=(3)/(5)` व `cos phi=-(12)/(13)`, जहाँ `theta` व `phi` द्वितीय चतुर्थांश में आते हो, तब निम्न के मान ज्ञात कीजिए |
`sin(theta-phi)`

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द्वितीय चतुर्थांश में, `cos theta=-(4)/(5),sin phi=(5)/(13)`

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