1.

यदि `y=cos^(-1)x` है, तो `(d^(2)y)/(dx^(2))` को केवल y के पदों में ज्ञात कीजिए ।

Answer» `y=cos^(-1) rArr x=cosy`
`rArr" "(dy)/(dx)=-siny`
`rArr" "(dy)/(dx)=-(1)/(siny)=-"cosec"y`
`rArr" "(d^(2)y)/(dx^(2))=(d)/(dx)(-"cosec y")`
`" "=-"cosec"^(2)y cot y`


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