Question

What should be taken away from -π2+3πy+2y to obtain 4π2-2πy-3y2​

Answer 1

Answer:

Setting x = −4, y = 2, and z = −3 in x2/16+y2/4+z2/9 = c we obtain c = 3. ... −4π2(cosh 2πy + sinh 2πy) sin 2πx + 4π2(cosh 2πy + sinh 2πy) sin 2πx = 0.