数学题英文
1》showthattheidentity:tanAcscA=tanAsinA+cosAistureforπ/32》provethefollowing:sin{3π/2-...
1》show that the identity : tanAcscA=tanAsinA+cosA is ture for π/3
2》prove the following: sin{3π/2 - θ}=-cosθ 展开
2》prove the following: sin{3π/2 - θ}=-cosθ 展开
2个回答
展开全部
1)tanA=tan(π/3)=3^0.5 cscA=csc(π/3)=2/3^0.5 sinA=sin(π/3)=3^0.5/2 cosA=cos(π/3)=1/2
tanAcscA=3^0.5*2/3^0.5 =2 tanAsinA+cosA=3^0.5*3^0.5/2 +1/2=2 so the identity is true
2)sin{3π/2 - θ}=sin(3π/2)cos θ-cos(3π/2)sinθ=-cosθ
正确!
tanAcscA=3^0.5*2/3^0.5 =2 tanAsinA+cosA=3^0.5*3^0.5/2 +1/2=2 so the identity is true
2)sin{3π/2 - θ}=sin(3π/2)cos θ-cos(3π/2)sinθ=-cosθ
正确!
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
2011-01-14
展开全部
1)tanA=tan(π/3)=3^0.5 cscA=csc(π/3)=2/3^0.5 sinA=sin(π/3)=3^0.5/2 cosA=cos(π/3)=1/2
tanAcscA=3^0.5*2/3^0.5 =2 tanAsinA+cosA=3^0.5*3^0.5/2 +1/2=2 so the identity is true
2)sin{3π/2 - θ}=sin(3π/2)cos θ-cos(3π/2)sinθ=-cosθ
tanAcscA=3^0.5*2/3^0.5 =2 tanAsinA+cosA=3^0.5*3^0.5/2 +1/2=2 so the identity is true
2)sin{3π/2 - θ}=sin(3π/2)cos θ-cos(3π/2)sinθ=-cosθ
本回答被提问者采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询