The principal solution of (5+3 )(2 +1)=0 are

MHT CET 2025 Mathematics question

Not in JEE Main syllabus

The principal solution of are

(A)
(B)
(C)Correct
(D)

Answer: (C)

Solution

Either , which is impossible since , or . Principal solutions are the solutions in . Cosine is negative in the second and third quadrants, with reference angle :

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Question ID VK-102904