已知tana=-2求下列各值
问题描述:
已知tana=-2求下列各值
(1)sina (2)sina-cosa/sina+cosa (3)sinacosa
(4)sin²a-sinacosa+4cos²a (5)sin²a+sinacosa+1
答
∵ tan a = - 2
已知tana=-2求下列各值
(1)sina (2)sina-cosa/sina+cosa (3)sinacosa
(4)sin²a-sinacosa+4cos²a (5)sin²a+sinacosa+1
∵ tan a = - 2