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If cos x=0 then x = ________(a) nπ(b) (2n+1) π/2(c) (n+1) π(d) nπ/2This question was addressed to me in an interview for job.This interesting question is from Trigonometric Functions topic in division Trigonometric Functions of Mathematics – Class 11

Answer»

Right choice is (B) (2n+1) π/2

To EXPLAIN: When KNOW, cos X =0 whenever x is π/2, 3π/2, 5π/2, ………… i.e. all odd INTEGRAL multiples of π/2

so, x=(2n+1) π/2 when cos x=0.



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