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    angle between these two planes

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    What is the angle between these two planes: x + 2y - z = 13 & -2x - 4y + 2z = -13?

    What is the second derivative of f(x, y) = 3x2y + 4y3 first with respect to y and then with respect to x?

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    What is the angle between these two planes: x + 2y - z = 13 & -2x - 4y + 2z = -13?

    The angle between the two planes is the angle between their normal:
    N1= (1, 2, -1), N2= (-2, -4, 2)
    N1.N2 = |N1||N2|cos(Ɵ)
    cos(Ɵ)= (N1.N2 )/|N1||N2|
    Ɵ=cos^(-1)⁡〖((N1.N2 ...

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