题目内容
直线xcos140°+ysin140°=0的倾斜角是( )
A.40° | B.50° | C.130° | D.140° |
B
选∵直线xcos 140°+ysin 140°=0
的斜率k=-
=-
=-
=
=
="tan" 50°,
∴直线xcos140°+ysin140°=0的倾斜角为50°.
的斜率k=-





∴直线xcos140°+ysin140°=0的倾斜角为50°.

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题目内容
A.40° | B.50° | C.130° | D.140° |