prove that sin 18 * sin 45=0.5?

👨🏻‍🏫 學術台數學

[匿名]

2016-06-20 7:15 am

回答 (1)

fooks

2016-06-20 7:23 am

Take the values to 4 significant figures.

sin18° × sin45°
= 0.3090 × 0.7071
= 0.2185
≠ 0.5

Hence, sin18° × sin45° ≠ 0.5

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