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irakobra [83]
3 years ago
14

Sinθ=1/4, 0<θ<90; cosθ

Mathematics
1 answer:
statuscvo [17]3 years ago
7 0
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:
\frac{ \sqrt{15}}{4}.
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