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Q 1815856760.     In the following determine whether the given
planes are parallel or perpendicular, and in case
they are neither, find the angle between them.
(a) `7x + 5y + 6z + 30 = 0`
and `3x - y - 10z + 4 = 0`
(b) `2x + y + 3z - 2 = 0` and `x - 2y + 5 = 0`
(c) `2x - 2y + 4z + 5 = 0`
and `3x - 3y + 6z - t = 0`
(d) `2x - y + 3z - 1 = 0` and `2x - y + 3z + 3 = 0`
(e) `4x + 8y + z - 8 = 0` and `y + z - 4 = 0`.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)