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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
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
option (A) is correct
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