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underset(x to 0)"Lt" (cos 7x-cos 9x)/(co...

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

A

`5//2`

B

`2//5`

C

`7//5`

D

`4//5`

Text Solution

Verified by Experts

The correct Answer is:
D
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