[" 27.The angle between the pair of plan...

[" 27.The angle between the pair of planes represented by "],[" equation "2x^(2)-2y^(2)+4z^(2)+6xz+2yz+3xy=0" is "],[[" (a) "cos^(-1)((1)/(3))," (b) "cos^(-1)((4)/(21))],[" (c) "cos^(-1)((4)/(9))," (d) "cos^(-1)((7)/(sqrt(84)))]]

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