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Grade:
        


If sinx + siny = p, cosx + cosy = q and tan(x/2) tan(y/2) = 4r, then (1+r)/(1-r) is equal to


a)      (p2-q2)/2q


b)      (p2+q2)/2q


c)      (p2+q2)/q


8 years ago

Answers : (1)

aku -- kumar
38 Points
							

option (A) is correct

8 years ago
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