An open-ended question~f.3
回答 (1)
2009-07-26 3:02 am
✔ 最佳答案
cosθ is larger than sinθ for 0<=θ< 45To justify the answer. Since cos 0 = 1, sin 0 = 0 and cos 45 = sin45
As cosθ is a decreasing function in the range 0 <=θ< 45
Using (cosθ)2+(sinθ)2=1, we get the result
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