tan(2π-a)cos(3π/2-a)cos(6π-a)/sin(a+3π/2)cos(a-π/2)
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tan(2π-a)cos(3π/2-a)cos(6π-a)/sin(a+3π/2)cos(a-π/2)
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化简:tan(π-a)cos(2π-a)sin(-a+3π/2)/cos(-a-π)sin(-π-a)
化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))
化简 cot(a+4π)cos(a+π)[sin(a+3π)]^2/tan(π+a)[cos(-π-a)]^2
sin^2(a+π) cos(π+a) cot(-a-2π) /tan(π+a) cos^3(-a-π)
已知f(a)={sin(π-a)cos(2π-a)tan[-a+(3π/2)]}/cos(-π-a)
化简:sin(π-a)cos(2π-a)tan(-a+π/2)/cos(-a)
求证tan(2π-a)cos(3π/2 -a)cos(6π -a) / sin(a+3π/2)cos(a+3π/2) =
tan(2π-a)cos(3π/2-a)cos(6π-a)/sin(a+3π/2)cos(a-π/2)
[sin(a+2kπ)+cos(π/2+a)+tan(3π-a)]/[sin(a-π)+cos(a-π/2)+cos(π
化简f(a)=sin(π\2-a)*cos(2π-a)*tan(-a+3π)
已知f(a)=sin(π+a)tan(π+a)cos(-a)/cos(3π-a)tan(2π-a),若a∈(0,π),c
化简sin(3π+a)tan(a-π)cot(π+a)/tan(2π-a)cos(π-a)