Lt(x to 0) (cos7x-cos9x)/(cos3x-cos7x)=...

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

`(5)/(2)`

`(2)/(5)`

`(7)/(5)`

`(4)/(5)`

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The correct Answer is:

LIMITS
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LIMITS
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LIMITS
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INVERSET TRIGONOMETRIC FUNCTIONS
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LOCUS
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