(1) 已知tana=1/2,tanb=1/3,0(3)满足cosacosb=根号3/2-sinasinb的一组a,b的值是选项A a=13派/12,b=3派/4,B a=派/2,b=派/3,C a=派/2,b=派/6 D a=派/3 b=派/4(4)若sin(派/2+s)=3/5,a为锐角,则sina=(5)若角a的始边在x轴正半轴,顶
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![(1) 已知tana=1/2,tanb=1/3,0(3)满足cosacosb=根号3/2-sinasinb的一组a,b的值是选项A a=13派/12,b=3派/4,B a=派/2,b=派/3,C a=派/2,b=派/6 D a=派/3 b=派/4(4)若sin(派/2+s)=3/5,a为锐角,则sina=(5)若角a的始边在x轴正半轴,顶](/uploads/image/z/1618242-42-2.jpg?t=%281%29+%E5%B7%B2%E7%9F%A5tana%3D1%2F2%2Ctanb%3D1%2F3%2C0%283%29%E6%BB%A1%E8%B6%B3cosacosb%3D%E6%A0%B9%E5%8F%B73%2F2-sinasinb%E7%9A%84%E4%B8%80%E7%BB%84a%2Cb%E7%9A%84%E5%80%BC%E6%98%AF%E9%80%89%E9%A1%B9A+a%3D13%E6%B4%BE%2F12%2Cb%3D3%E6%B4%BE%2F4%2CB+a%3D%E6%B4%BE%2F2%2Cb%3D%E6%B4%BE%2F3%2CC+a%3D%E6%B4%BE%2F2%2Cb%3D%E6%B4%BE%2F6+D+a%3D%E6%B4%BE%2F3+b%3D%E6%B4%BE%2F4%284%29%E8%8B%A5sin%28%E6%B4%BE%2F2%2Bs%29%3D3%2F5%2Ca%E4%B8%BA%E9%94%90%E8%A7%92%2C%E5%88%99sina%3D%285%29%E8%8B%A5%E8%A7%92a%E7%9A%84%E5%A7%8B%E8%BE%B9%E5%9C%A8x%E8%BD%B4%E6%AD%A3%E5%8D%8A%E8%BD%B4%EF%BC%8C%E9%A1%B6)
(1) 已知tana=1/2,tanb=1/3,0(3)满足cosacosb=根号3/2-sinasinb的一组a,b的值是选项A a=13派/12,b=3派/4,B a=派/2,b=派/3,C a=派/2,b=派/6 D a=派/3 b=派/4(4)若sin(派/2+s)=3/5,a为锐角,则sina=(5)若角a的始边在x轴正半轴,顶
(1) 已知tana=1/2,tanb=1/3,0
(3)满足cosacosb=根号3/2-sinasinb的一组a,b的值是
选项A a=13派/12,b=3派/4,B a=派/2,b=派/3,C a=派/2,b=派/6 D a=派/3 b=派/4
(4)若sin(派/2+s)=3/5,a为锐角,则sina=
(5)若角a的始边在x轴正半轴,顶点在坐标原点,a终边与单位圆交点的横坐标为-0.sina=?
(1) 已知tana=1/2,tanb=1/3,0(3)满足cosacosb=根号3/2-sinasinb的一组a,b的值是选项A a=13派/12,b=3派/4,B a=派/2,b=派/3,C a=派/2,b=派/6 D a=派/3 b=派/4(4)若sin(派/2+s)=3/5,a为锐角,则sina=(5)若角a的始边在x轴正半轴,顶
(1)
tana=1/2,tanb=1/3,tan(a+b)=1,因为0
1) tan(a+b)=(tana+tanb)/(1-tanatanb)=1;
因为0所以 a+b=5π/4.
2)因为a属于(0,π)cosa=1/5,所以sina=2*根号6/5
cos(a-π/3)=cosacosπ/3+sinasinπ/3=(1+6根号3)/10
(1)5/4派(直接算正切a+b,再算a+b)
(2)(抱歉,我不会打出根号)1/10+3/5倍的根号2(算出正弦a,然后展开)
(1)tan(A+B)=(tanA+tanB)/(1-tanA*tanB)=1 派小于A+B小于2派 A+B=5派/4
(2)sinA=不是吧,这些都是最基础的题,很简单的,你是没学过还是没认真听讲?是不是作业不想做了?建议复习一遍自己做!
1问a+b=45度(用两角和正切公式)2问(1-4根号2)/10