设sinA+cosA=1/5,0
设sinA+cosA=1/5,0
设tanA= Sina-cosa / Sina+cosa且0
已知4sinacosa-5sina-5cosa-1=0求sina.sina.sina+cosa.cosa.cosa的值.
已知(2sinA+cosA)/(sinA-cosA)=-5 求1、(sinA+cosA)/(sinA-cosA) 2、3
设cosa+(cosa)^2=1,求(sina)^2+(sina)^6+(sina)^8的值
已知sina+cosa=1/5,0
知sina+cosa=1/5,0
sina+cosa=1/5(0
已知sina+cosa=-1/5(0
已知sina+cosa=1/5(0
sina+cosa=1/5,0
已知sina+cosa=-1/5,0