7th one..
Q.7.
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Here is a link to a similar query
https://www.meritnation.com/ask-answer/question/how-to-doevaluate-limx-0-1-cos4x-1-cos5x/limits-and-derivatives/7394067
Here is a link to a similar query
https://www.meritnation.com/ask-answer/question/how-to-doevaluate-limx-0-1-cos4x-1-cos5x/limits-and-derivatives/7394067