已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.求角a的正弦值、余弦值与正切值1.已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.(1)求角a的正弦值、余弦值与正切值.2.设f(x)=log(1-
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![已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.求角a的正弦值、余弦值与正切值1.已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.(1)求角a的正弦值、余弦值与正切值.2.设f(x)=log(1-](/uploads/image/z/7038037-37-7.jpg?t=%E5%B7%B2%E7%9F%A5a%E6%98%AF%E7%AC%AC%E4%BA%8C%E8%B1%A1%E9%99%90%E8%A7%92%2C%E4%B8%94sin%28%CF%80%2Ba%29%3Dk-1%2Fk%2B1%2Csin%285%CF%80%2F2%2Ba%29%3D3k-1%2Fk%2B1.%E6%B1%82%E8%A7%92a%E7%9A%84%E6%AD%A3%E5%BC%A6%E5%80%BC%E3%80%81%E4%BD%99%E5%BC%A6%E5%80%BC%E4%B8%8E%E6%AD%A3%E5%88%87%E5%80%BC1.%E5%B7%B2%E7%9F%A5a%E6%98%AF%E7%AC%AC%E4%BA%8C%E8%B1%A1%E9%99%90%E8%A7%92%2C%E4%B8%94sin%28%CF%80%2Ba%29%3Dk-1%2Fk%2B1%2Csin%285%CF%80%2F2%2Ba%29%3D3k-1%2Fk%2B1.%EF%BC%881%EF%BC%89%E6%B1%82%E8%A7%92a%E7%9A%84%E6%AD%A3%E5%BC%A6%E5%80%BC%E3%80%81%E4%BD%99%E5%BC%A6%E5%80%BC%E4%B8%8E%E6%AD%A3%E5%88%87%E5%80%BC.2.%E8%AE%BEf%28x%29%3Dlog%281-)
已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.求角a的正弦值、余弦值与正切值1.已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.(1)求角a的正弦值、余弦值与正切值.2.设f(x)=log(1-
已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.求角a的正弦值、余弦值与正切值
1.已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.(1)求角a的正弦值、余弦值与正切值.2.设f(x)=log(1-2sinx/1+2sina)(1)判断函数y=f(x)的奇偶性(2)求函数y=f(x)的定义域和值域.3.已知a为常数,x∈R,试利用三角恒等式sinx+cosx=根号2(x+π/4)求函数y=sinxcosx-根号2(sinx+cosx)的最大值M(a)和最小值m(a).
已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.求角a的正弦值、余弦值与正切值1.已知a是第二象限角,且sin(π+a)=k-1/k+1,sin(5π/2+a)=3k-1/k+1.(1)求角a的正弦值、余弦值与正切值.2.设f(x)=log(1-
sin(π+a)=-sina=k-1/k+1,sin(5π/2+a)=cosa=3k-1/k+1,所以(k-1/k+1)+(3k-1/k+1)=1 整理得9k-10k+1=0,所以k=1或1/9,因为a是第二象限角,所以k≠1,所以k=1/9,所以sina=4/5,cosa=-3/5,所以tana=-4/3