√(sin²θ-cos²θ)
=√(-cos2θ)为什么√(sin²θ-cos²θ)=√(-cos2θ)根据二倍角公式cos2θ=cos²θ-sin²θ
猜你喜欢
- 1金属生锈的条件是______,_______,_______
- 2文言文中的倒装句的分类及例句
- 3连词成句 I,you,my,party,birthday,like,invite,would,to,to
- 4计算66（2个）+666（3个）+6666+66666+666666+666666+6666666+66666666+666666666（9个）
- 5脑筋急转弯：外国人问路,小明拼命有英语对他说,他却一点也听不懂,这是为什么?
- 6The big fire was finally ______(控制)by the firemen.
- 7Your parents will see how good you are a______ push-ups,as well as math.
- 8You may only be a person in this world , But for some you"re the world .
- 9化学填空题,怎么填
- 10浅析如何将生活实例融入到初中物理教学中