area 1/2 ab sin c

b/c=1/2 =sin 3002=cos 6002a/c=√3/2 =sin 6002=

有一个重量为20 n的小物体放在斜面上,斜面底边长ab=40 cm,高bc=30 cm

a3 b3=(a b)(a2-ab b2) a3-b3=(a-b)(a2 ab b2)三角不等式|a

4,同角三角函数基本关系式:1cos sin = αα α αcos tan = 第1

$c所对的边分别为a,b,c,且 $$\sin a \cos c c \sin a \cos a= \frac$

c所对的边分别为a,b,c,且 $$\sin a \cos c c \sin a \cos a= \frac

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