[" If "y=cos^(-1)x" ,then the value of "...

[" If "y=cos^(-1)x" ,then the value of "(d^(2)y)/(dx^(2))" in terms of "y],[" alone is "],[[" (a) "-cot y cosec^(2)y," (b) "cosec y cot^(2)y],[" (c) "-cot y cosec y," (d) None of these "]]

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