Please solve question number 12

Please solve question number 12 11. Provc that for the curve y = c cos h —, thc radius of curvatwe at any point varies as the square of the ordinate at that 12 Prmethattheradiusofcuwa1ureoftheconicax2 + by2 =lvariesasthecubeofthc length of thenonnal, 13. Show that in the parabola v 2 = 4ax, the radius of cunature at any m•intP is twice the parl of the normal intercepted t-*tween the cune and the directrix. 14. Show that the radius of culNature for the curve y z a cos h — is equal to the normal intercepted between

Dear student
This question   relates   to the concept which will be taught in higher classes i.e. class  XI. Kindly ask the questions related to your grade.
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