网址:http://m.1010jiajiao.com/timu_id_4020287[举报]
曲线在点处的切线的倾斜角为
A.30° B.45° C.60° D. 120°
A.30° B.45° C.60° D.120°
曲线在点 处的切线的倾斜角为
A.30° B 45° C.60° D.135°