Hello Raina
Please check Ex 5.7, 14 of Chapter 5 Continuity and Differentiability Class 12 here https://www.teachoo.com/3709/703/Ex-5.7--14---If-y-=-A-emx---B-enx--show-d2y-dx2---(m---n)/category/Ex-5.7/
For solutions of all NCERT Questions of Class 12, please visit https://www.teachoo.com/maths/