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0 votes
1.7k views
in Trigonometry by (15 points)
The value of cos[π/2 + sin-¹ 1/3] is

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1 Answer

+1 vote
by (18.1k points)

cos(π/2 + sin-1 1/3) = -sin(sin-1 1/3) (∵ cos(π/2 + θ) = -sinθ)

 = -1/3 (∵ sin(sin-1x) = x)

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