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Evaluate the following limit: lim(x->0)(...

Evaluate the following limit: `lim_(x->0)(cos3x-cos5x)/(x^2)`

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`lim_(x->0)(cos3x-cos5x)/(x^2)`
`=lim_(x->0)(2sin4x sin x)/(x^2)`
`=lim_(x->0)((sin4x)/(4x)xx(sin x)/(x)xx8)`
`=8xx1xx1`
`=8`
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  3. Evaluate the following limit: lim(x->0)(cos3x-cos5x)/(x^2)

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