sin,cos,tan如何计算，在不同数值时该怎么计算
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=sin(45\u00b0+60\u00b0)
=sin45\u00b0cos60\u00b0+cos45\u00b0sin60\u00b0
=\u221a2/2 \u00d71/2 +\u221a2/2 \u00d7\u221a3/2
=(\u221a2+\u221a6)/4
\u540c\u7406
\u53ef\u4ee5\u7b97cos105\u00b0=cos(45\u00b0+60\u00b0)
=cos45\u00b0cos60\u00b0-sin45\u00b0sin60\u00b0
=\u221a2/2 \u00d71/2 -\u221a2/2 \u00d7\u221a3/2
=(\u221a2-\u221a6)/4
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sin∠A=BC/AB（对边比斜边）
cos∠A=AC/AB（邻边比斜边）
tan∠A=BC/AC（对边比邻边）
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