if sin teta =11/61 , find the value of cos teta using trigonometric identities ? whowill give answer I will make him briliant list
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We know :
sinθ = Opposite Side/Hypotenuse
To Find :
Value of cosθ
Solution :
cosθ = Adjacent Side/Hypotenuse
cosθ = Adjacent Side/61
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- Using Pythagoras Theorem
(Hypotenuse)² = (Opposite side)² + (Adjacent Side)²
⇒ (61)² = (11)² + (Adjacent Side)²
⇒ 3721 = 121 + (Adjacent Side)²
⇒ 3721 - 121 = (Adjacent Side)²
⇒ 3600 = (Adjacent Side)²
⇒ 60 = Adjacent Side
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cosθ = 60/61
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