shai1028 shai1028
  • 22-04-2021
  • Mathematics
contestada

Find sin theta if cos theta is 4/5

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Respuesta :

ghanami
ghanami ghanami
  • 23-04-2021

Answer:

Step-by-step explanation:

hello :

cos²θ +sin²θ = 1 and cosθ =4/5

(4/5)² + sin²θ = 1 so : sin²θ = 1 - 16/25

sin²θ = 9/25 = (3/5)²

sinθ = 3/5 or sinθ = - 3/5 because : (3/5)²= (- 3/5)²= 9/25

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