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If `ST` and `SN` are the lengths of subtangents and subnormals respectively to the curve `by^2 = (x + 2a)^3.` then `(ST^2)/(SN)` equals(A)`1`(B) `(8b)/27`(C) `(27b)/8`(D) `((4b)/9)`A. `(8b)/27`B. `(8a)/27`C. `b/a`D. none of these |
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Answer» Correct Answer - A `(dy)/(dx)=(3(x+a)^(2))/(2by)` for `p/q=((y/((dy)/(dx)))^(2))/(y.(dy)/(dx))=y/(((dy)/(dx))^(3))` `implies p/q=(8b)/27` |
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