tan2a=-2根号2,2a属于(90`,180`),求[cos^2(a/2)-sina-1]/根号2sin(a+45`
tan2a=-2根号2,2a属于(90`,180`),求[cos^2(a/2)-sina-1]/根号2sin(a+45`
tan2a=-2根号2,2a属于(90`,180`),求 [2cos^2(a/2)-sina-1]/根号2sin(a+4
设tan2a=-2根号2,求cos^a/根号2-sina-1/2sin(a+/pai4)
设tan2a=2根号2,a属于(π/2,π),求(2cos^a/2-sina-1)/(sina+cosa)
设tan2a=-2根号2,2a在180度与360度之间,求[2cos^2(a\2)-sina-1]/根号2(a+pi/4
sina=3/5,a∈(0,π/2),求tan2a+根号2cos(a-π/4)
tanatan2a/(tan2a-tana)+根号3(sin^2a-cos^2)=2sin(2a-派/3) 证明下
sina-cosa=(根号2)/5,求sin(π+a)+cos(π-a)=?
已知sina+cosa=根号2,求sinacosa,tana,sin^4a+cos^4a
求f(x)=cosa/根号下(1-sin^2a)+根号下(1-cos^2a)/sina-tanx/根号下(sec^2a-
已知tan2a=-2√2,2a属于(π/2,π),求(2cos平方a/2-sina-1)/(√2sin(a+π/4)的值
已知a∈(π/2,π)sina=根号5/5,则tan2a等于多少