If cos(a) = 2/3,find the value of cos(4a)
If cos(a) = 2/3,find the value of cos(4a)
关于相反数.关于opposite number.If |a|=4,|b|=3,a>b,find the value of
Find the minimum value of A=x^2 + y^2 if x + y =10
if cos(1/2)x=(√5)/4 what is the value of cos^2x?1)1/64 2)1/4
If sin(x) = 4/5,pi/2 < x < pi,find the value of sin(2x)
given that a+b=7 and ab=12,find the value of 2a(square)b+2ab
Find the value of 2a+10 when a is equal to 4.5
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
证明sin(4A)sin(2A)(1-cos(2A)) cos(4A)cos(2A)(1 cos(2A))=cos(2A
已知(4sin a-2cos a)/(5cos a +3sin a)=6/11,求cos^4 a-sin^4 a
已知sin a-2cos a=0 求4sin^2 a-3sin a x cos a-5cos^2 a的值
已知tan a=-1/3,求4sin a-2cos a/5cos a+3sin a=