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If Sin θ = 20/29, then what is the value of Cos θ?
- A29/21
- B21/29
- C21/20
- D20/29
Answer not set
Discussion 1
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CCommunity
Since we know that Cos θ = √(1 - sin2 θ)
⇒ Cos θ = √(1 - 202/292)
⇒ Cos θ = √{(841 - 400)/292}
⇒ Cos θ = √{(212)/292} = 21/29
∴ Cos θ = 21/29
⇒ Cos θ = √(1 - 202/292)
⇒ Cos θ = √{(841 - 400)/292}
⇒ Cos θ = √{(212)/292} = 21/29
∴ Cos θ = 21/29