设直线ax+by+c=0的倾斜角为a,且sina+cosa=0,则a,b满足我想要详细的解题思路谢谢.A a+b=1 B a-b=1 C a+b=0 Da-b=0
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设直线ax+by+c=0的倾斜角为a,且sina+cosa=0,则a,b满足我想要详细的解题思路谢谢.A a+b=1 B a-b=1 C a+b=0 Da-b=0
设直线ax+by+c=0的倾斜角为a,且sina+cosa=0,则a,b满足
我想要详细的解题思路谢谢.A a+b=1 B a-b=1 C a+b=0 Da-b=0
设直线ax+by+c=0的倾斜角为a,且sina+cosa=0,则a,b满足我想要详细的解题思路谢谢.A a+b=1 B a-b=1 C a+b=0 Da-b=0
sina=-cosa
tana=sina/cosa=-1
倾斜角的正切就是斜率
ax+by+c=0
y=(-a/b)x-c/b
斜率k=-a/b=-1
a=b
a-b=0
选D