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

Evaluate the following limit: `(lim)_(x->0)(cos a x-cos b x)/(cosc x-cos dx)`

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`(lim)_(x->0)(cos a x-cos b x)/(cosc x-cos dx)`

L'Hopital Rule:

`lim_(x rightarrow b) (f(x))/(g(x))=lim_(x rightarrow b) (f'(x))/(g'(x))`

`(lim)_(x->0)(-asin a x+bsin b x)/(-csinc x+dsindx)`

`(lim)_(x->0)(-a*ax+b*bx)/(-c*cx+d*dx)`

`(lim)_(x->0)(-a^2x+b^2x)/(-c^2x+d^2x)`

`=(-a^2+b^2)/(-c^2+d^2)`

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