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1.(cos5x - cos9x)/(1-Vcosx)
= (-5sin5x + 9sin9x)/ (0 -1/2(cos^1/2 x) .-sinx)
sin coret
=( -25x + 81x)/(1/2x/V(cosx))
= 56x / (1/2x)
= 56 . 2 = 112
2. no.duanya ,ribet..
maaf ya kak...