Question

43. Usually d2z/dy2 denote by the letter
(A)
(B) +
(C) P
(D)p​

Answer 1

Answer:

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Answer 2

Usually we denote $\frac{\partial^{2}z}{\partial y^{2}}$ by the letter $t$.

Explanation:

• In Partial Differential Equations, we take $z$ as the dependent variable and $x,y$ as independent variables.

• We write some universally accepted symbols as follows:

• $\frac{\partial z}{\partial x}=p$

• $\frac{\partial z}{\partial y}=q$

• $\frac{\partial^{2}z}{\partial x^{2}}=r$

• $\frac{\partial^{2}z}{\partial x\partial y}=s$

• $\frac{\partial^{2}z}{\partial y^{2}}=t$

NOTE:

A P.D.E. is called Linear Partial Differential Equation if all the derivatives in it are of the first degree.