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त्रिकोणमितीय सारणी के प्रयोग के बिना हल ...

त्रिकोणमितीय सारणी के प्रयोग के बिना हल करो:
`cos (40^(@)+theta)-sin (50^(@)-theta ) +(cos ^(2)40^(@)+cos ^(2)50^(@))/(sin ^(2)40^(@)+ sin ^(2)50^(@))`

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