(1)若sinacosa=1/8,且π/4<a<π/2,求cosa-sina.(2)已知sina+cosa/sina-c
(1)若sinacosa=1/8,且π/4<a<π/2,求cosa-sina.(2)已知sina+cosa/sina-c
已知3sina+cosa=0求(1)(3cosa+5sina)/sina-cosa(2)sina+2sinacosa-3
已知3sina=-cosa,求值 (1)sina-3cosa/sina+3cosa (2)1+sinacosa
已知sinacosa=1/4,且a属于(0,π/4),则sina-cosa=?
已知sina*cosa=1/8,且π/4小于a小于π/2,求cosa-sina=
已知4sinacosa-5sina-5cosa-1=0求sina.sina.sina+cosa.cosa.cosa的值.
已知sina+cosa=1/5求sinacosa,sina-cosa
已知(2sinA+cosA)/(sinA-cosA)=-5 求1、(sinA+cosA)/(sinA-cosA) 2、3
已知sina+cosa=p,求(1)sinacosa (2)sina平方-cosa平方 (3)sina三次方加减cosa
已知tana=3, (1)sina-cosa/sina+cosa (2)(sina)^2-3sinacosa+1 急!
已知sina*cosa=60/169,且a∈(π/4,π/2),求cosa,sina的值?
已知sinacosa=1/8,且a是第三象限角,求1-cos^2a/sina-cosa-sina+cosa/tana^2