1. lim(x->0) cos4x-1/cos5x-cos3x=...

2. lim (x->0) 4x/cos5x-cos3x =…
3. lim (x->0) 1-cosx/xsin2x =…

1. lim(x->0) cos4x-1/cos5x-cos3x=…

Jawaban Terkonfirmasi

$displaystyle lim_{x to 0} frac{cos4x-1}{cos5x-cos3x} \ \ = lim_{x to 0} frac{(1-2sin^22x)-1}{-2sin frac{8x}{2} .sin frac{2x}{2} } \ \ =lim_{x to 0} frac{-2sin^22x}{-2sin 4x .sin x } \ \ =lim_{x to 0} frac{-2sin2x.sin2x}{-2sin 4x .sin x } \ \ = frac{-2}{-2}. frac{2}{4} . frac{2}{1} \ \ =1$