dabean423564
dabean423564
23-03-2018
Mathematics
contestada
sinθ=1/4, 0<θ<90; cosθ
Respuesta :
evgeniylevi
evgeniylevi
23-03-2018
Try this option:
1. rule: if θ∈(0;90°), then cosθ>0 and sinθ>0;
2. using the rule and sin²θ+cos²θ=1, ⇒ cosθ=√(1-sin²θ)=√15/4.
answer:
[tex] \frac{ \sqrt{15}}{4}.[/tex]
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