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Akanki agrawal

· started a discussion

· 1 Months ago

?? (Question: 336957.0 )

By which rule we can write
tan^2(x-y)/2 = 1-cos(x+y)/ 1+cos(x+y)


Please explain sir...

Question:

    

Options:
A)

  

B)

      

C)

  

D)

  

Solution:

Ans: (b)


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