If alpha,beta in (-pi/2,0) such that (si...

If `alpha,beta in (-pi/2,0)` such that `(sin alpha+sinbeta)+(sinalpha)/(sinbeta)=0 and (sinalpha+sinbeta) (sinalpha)/(sinbeta)=-1 and lambda=lim_(n->oo) (1+(2sinalpha)^(2n))/((2sinbeta)^(2n))` then :

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