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" Find "Lt(cos7x-cos9x)/(cos3x-cos5x)...

" Find "Lt(cos7x-cos9x)/(cos3x-cos5x)

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int(cos7x-cos8x)/(cos2x-cos3x)dx

int(cos7x-cos8x)/(cos2x-cos3x)dx

underset(x to 0)"Lt" (cos 7x-cos 9x)/(cos 3x-cos 7x)=

Lt_(x to 0) (cos7x-cos9x)/(cos3x-cos7x)=

Evaluate : underset(xrarr0)"lim"(cos5x-cos7x)/(cosx-cos5x)

2cos x-cos3x-cos5x=

Evaluate the limits: lim_(xrarr0)(cos7x-cos9x)/(cosx-cos5x)

Prove : underset(xrarr0)"lim"(cos9x-cos7x)/(cos7x-cos5x)=(4)/(3)

lim_(x rarr0)(cos7x-cos9x)/(cos x-cos5x)

lim_(x->0) (cos2x-cos4x)/(cos3x-cos5x) =