`lim_(x->0)((1-cosxsqrt(cos2x))/(x^2)+root3((1+cos^3x+3cos^2x+3cosx)/(cosx+63)))` is equal to

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(lim)_(x->0)(cos2x-1)/(cosx-1)

cosx + cos2x + cos3x=0

Evaluate lim_(xrarr0)((1-cosxsqrt(cos2x)))/(x^(2)).

lim_(x-gt0)(cos2x-cos3x)/(cos4x-1)

lim_(xto0)((1-cos2x)(3+cosx))/(x tan 4x) is equal to

lim_(x rarr0)((1-cos2x)(3+cos x))/(x tan4x) =

(1)/(cos3x-cosx)

lim_(x to 0) ((1-cos 2x)(3+cosx))/(x tan 4x) is equal to