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If cos 9a = sin ɑ and 9ɑ < 90° , then the value of tan 5ɑ is

A1/√3

B√3

C1

D0

Answer:

C. 1

Read Explanation:

cos (90-x) = sin x cos 9ɑ = sin ɑ cos 9ɑ = cos(90-ɑ) 9ɑ+2 = 90 10ɑ = 90 ɑ = 9 tan 5ɑ = tan (5 x 9) = tan 45 =1


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