If cos 9α = sin α and 9α < 90° , then the value of tan 5α is
(A) 1/√3 (B) √3 (C) 1 (D) 0


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Last updated at May 29, 2023 by Teachoo
Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class
Question 10 If cos 9α = sin α and 9α < 90° , then the value of tan 5α is (A) 1/√3 (B) √3 (C) 1 (D) 0 Given cos 9α = sin α cos 9α = cos (90° − α) Comparing angles 9α = 90° − α 9α + α = 90° 10α = 90° α = (90° )/(10° ) α = 9° Now, tan 5α = tan (5 × 9°) = tan 45° = 1 So, the correct answer is (C)