(1)向量a平行于向量b,也就是有a和b的对应坐标成比例既是有
正弦值β/1=(余弦值β—2倍的正切值β)/2
你据此就可以算出正切值β了呵呵}
第二个题目中向量a=向量b,也就是有正弦值β=1且余弦值β—2倍的正切值β=2
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已知向量a=(正弦值β,余弦值β—2倍的正切值β),向量b=(1,2).(1)若向量a平行于向量b,求正切值β; (2)若向量a=向量b,0
已知向量a=(正弦值β,余弦值β—2倍的正切值β),向量b=(1,2).(1)若向量a平行于向量b,求正切值β; (2)若向量a=向量b,0
数学人气:308 ℃时间:2019-11-10 15:57:15
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