WBJEE 2021 Math Solved Paper

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CATEGORY - II (Q51 to Q65)
Carry 2 marks each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ½ mark will be deducted.
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Question : 62 of 75
 
Marks: +1, -0
The plane fx+my=0 is rotated about its line of intersection with the plane z=0 through an angle alpha. The equation changes to
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