14.1-bo'lim: Tangens tekisliklar va chiziqli yaqinlashishlar

1. \(\left( {2, - 1} \right)\) da \(\displaystyle z = {x^2}\cos \left( {\pi y} \right) - \frac{6}{{x{y^2}}}\) ga teguvchi tekislik tenglamasini toping. Yechim
2. \(\left( { - 4,3} \right)\) da \(z = x\sqrt {{x^2} + {y^2}} + {y^3}\) ga teguvchi tekislik tenglamasini toping. Yechim
3. \(\left( { - 2,4} \right)\) da \(z = 4{x^2} - y{{\bf{e}}^{2x + y}}\) ga chiziqli yaqinlashishni toping. Yechim