If y=sinx , then (d^2(cos^7x)/(dy^2) is ...

If `y=sinx ,` then `(d^2(cos^7x)/(dy^2)` is equal to `35cos^3x-42cos^5x` `35cos^3x+42cos^5x` `42cos^3x-35cos^5x` `-35cos^3x-42cos^5x`

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