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In the follwing cases , determine whethe...

In the follwing cases , determine whether the given planes are parallel or perpendicular and in case they are neither , find the angles 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-1=0
d. 2x-y+3z-1=0 and 2x-y+3z+3=0
e. 4x+8y+z-8=0 and y+z-4=0

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