用什麼方法不使用計算機求三角比值?

2016-02-19 11:19 am

Sin 510°, cos 600°

求過程，謝謝！

回答 (3)

2016-03-21 4:42 am

sin 510°
=sin(360°+180°-30°)
=sin30
=0.5

cos 600°
=cos (360°+180°+60°)
=-cos60
=-0.5

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2016-02-19 2:49 pm

sin 510°
= sin(360°+150°)
= sin150°
= sin(180°-30°)
= sin30°
= 1/2

cos 600°
= cos(360°+240°)
= cos240°
= cos(180°+60°)
= -cos60°
= -1/2

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2016-02-19 11:32 am

sin 510°
=sin(360°+150°)
=sin150°
=sin(180°-30°)
=sin30°
=1/2

cos 600°
=cos(360°+240°)
=cos240°
=cos(180°+60°)
=-cos60°
=-1/2

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