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sin sec tan 在90°以內的角來看 角度越大值越大
其他則反之 角度越大值越小
這題的角度小 所以要找角度小值卻大的cos csc cot
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2 11.下列三角形范數值何者最大? (Asin20。 (B)tan20。 (Csee20 so
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