sina-cosa=1/2,求sin^3a-cos^3a值
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sina=2cosa,求(1)3sina+2cosa(2)sin²a+sina×cosa+3
(1-tana)/(1+tana)=2求(1)sina+cosa/(sina+2cosa) (2)sina-cosa(3)sin^2a-3cos^2a+1
已知tana/tana-1=-1,求下列各式的值(1)sina-3cosa/sina+cosa(2)sin^2a+sina*cosa+2
已知tana/(tana-1)=-1,求下列各式的值(1)sina-3cosa/sina+cosa(2)sin^2a+sina*cosa+2
sin(a+kπ)=2cos[a+(k+1)π].求5cosa+3sina/4sina-2cosa
sin(a+kπ)=2cos[a+(k+1)π].求5cosa+3sina/4sina-2cosa
已知tana=-3,求sina+2cosa/cosa-3sina和sin^2a-sinacosa
sina+cosa/sina-cosa=2 求sin^2a-2sinacosa+1
已知(2sinA+cosA)/(sinA-cosA)=-5 求1、(sinA+cosA)/(sinA-cosA) 2、3cos2A+sin2A
已知tana=3,求下列各式的值 1.sina+cosa/sina-cosa 2.sina.cosa 3.sin^2 a+sina.cosa
已知(sina+cosa)/(sina-cosa)=3 则2sin'a+(sina-cosa)'=?
已知(sina+cosa)/(sina-cosa)=2,则:(3sina+cosa)/(2sina+3cosa)=?sin^2a-2sinacosa+1=?
已知sina+cosa/sina-cosa=2,计算下列各式的值(1)3sina+cosa/2sina+3cosa(2)sin^a-2sinacosa+1.
已知tana=2,求下列个式的值(1)(sin^3a+cosa)/sina (2)sina(3)sina+cosa
已知tan a =-1/3,求sina-2cosa/3sina+4cosa和sin^2a-3sin a cos a +2的值.
已知sina-2cosa=0求sina-3cosa/sina+3cosa求sin²a+sinacosa+3
已知tan(π-a)=2,求值:(1)2sin+2cosa/7sina+cosa(2)sina*cosa(3)4cosa^2+3sina^2
已知(sin²A+4)/(cosA+1)=2,求(cosA+3)*(sinA+1)的值