If {A}, {B}, {C} are real numbers, then find value of |\table 1 , \cos ({B}-{A}) ,\cos ({C}-{A}) ; \cos ({A}-{B}) ,1 , \cos ({C}-{B}) ;\cos ({A}-{C}), \cos ({B}-{C}) , 1 |

Correct Answer is : independent of A,B,C

\cos A \cdot \cos C+\cos B \cos C +\cos A \cos B

JEE Advanced 2021 Full Test 4 Paper 1

PART – III

Mathematics

SECTION – A (One Options Correct Type)
This section contains 06 multiple choice questions. Each question has four choices (A), (B), (C) and (D), out of which ONLY ONE option is correct.

Question : 42 of 54

Marks: +1, -0

If A,B,C are real numbers, then find value of

1	cos(B−A)	cos(C−A)
cos(A−B)	1	cos(C−B)
cos(A−C)	cos(B−C)	1

cos‌A+cos‌B+cos‌C
cos‌A.cos‌B.cos‌C
independent of A,B,C
cos‌A‌cdot‌cos‌C+cos‌B‌cos‌C +cos‌A‌cos‌B

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cos‌A	sin‌A	0
cos‌B	sin‌B	0
cos‌C	sin‌C	0

cos‌A	sin‌A	0
cos‌B	sin‌B	0
cos‌C	sin‌C	0