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![SOLVED:(a) Find the directional derivative of ϕ=x^2+siny-x z in the direction i+2 𝐣-2 k at the point (1, π/ 2,-3). (b) Find the equation of the tangent plane and the cquations of SOLVED:(a) Find the directional derivative of ϕ=x^2+siny-x z in the direction i+2 𝐣-2 k at the point (1, π/ 2,-3). (b) Find the equation of the tangent plane and the cquations of](https://cdn.numerade.com/previews/59fcd772-aeed-45af-b214-dd077032866a_large.jpg)
SOLVED:(a) Find the directional derivative of ϕ=x^2+siny-x z in the direction i+2 𝐣-2 k at the point (1, π/ 2,-3). (b) Find the equation of the tangent plane and the cquations of
![Let `y=f(x).phi(x) and z=f'(x).phi'(x).` prove that `1/y*(d^2y)/(dx^2 )=1/f*(d^2f)/(dx^2)+1/phi - YouTube Let `y=f(x).phi(x) and z=f'(x).phi'(x).` prove that `1/y*(d^2y)/(dx^2 )=1/f*(d^2f)/(dx^2)+1/phi - YouTube](https://i.ytimg.com/vi/Twpm_sxgXtc/maxresdefault.jpg)
Let `y=f(x).phi(x) and z=f'(x).phi'(x).` prove that `1/y*(d^2y)/(dx^2 )=1/f*(d^2f)/(dx^2)+1/phi - YouTube
![a) A transparent polarisation sensitive phase pattern, a darker region... | Download Scientific Diagram a) A transparent polarisation sensitive phase pattern, a darker region... | Download Scientific Diagram](https://www.researchgate.net/publication/356853593/figure/fig1/AS:1098770611748864@1638978736617/a-A-transparent-polarisation-sensitive-phase-pattern-a-darker-region-represents-phx-2.png)
a) A transparent polarisation sensitive phase pattern, a darker region... | Download Scientific Diagram
![trigonometry - Deriving $\psi_1(x)=\frac{3\sqrt\pi}{2}\phi_0(x) + \frac{7\sqrt\pi}{4\sqrt2} \phi_1(x) - \frac{\sqrt\pi}{2\sqrt2} \phi_2(x)...$ - Mathematics Stack Exchange trigonometry - Deriving $\psi_1(x)=\frac{3\sqrt\pi}{2}\phi_0(x) + \frac{7\sqrt\pi}{4\sqrt2} \phi_1(x) - \frac{\sqrt\pi}{2\sqrt2} \phi_2(x)...$ - Mathematics Stack Exchange](https://i.stack.imgur.com/CByBe.jpg)