化简 sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|2+a)
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化简sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|2+a)化简sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|
化简 sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|2+a)
化简 sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|2+a)
化简 sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|2+a)
化简 sin(α-2π)sin(α+π)-2cos(α-π/2)sin(α-π)-cos²(π/2+α)
原式=-sin(2π-α)sin(π+α)+2cos(π/2-α)sin(π-α)-(-sinα)²
=-sin²α+2sin²α-sin²α=0
化简:sin(-a)cos(2π+a)sin(-a-π)
化简sin(2π+a)
化简;sin^2 A+sin^2(A-π/3)+sin^2(A+π/3)
化简sin^2A+sin^(A-π/3)+sin(A+π/3)
化简1+sin(a-2π)*sin(π+a)-2cos(-a)
sin²(a+π)cos(π+a)sin(-a-2π)/sin(π-a)cos³(-a-π) 化简
化简sin(2π-a)sin(π+a)coa(-π-a)除以sin(3π-a)cos(π-a)
化简 sin(2π-a)sin(π+a)cos-π-a) / sin(3π-a)cos(π-a)
化简 sin(5π/2-a) 和 sin(a-3π/2)RT
化简:sin(a-2π)cos(a+π)tan(a-99π)/cos(π-a)sin(3π-a)sin(-a-π)
[sin(a-6π)cos(7π/2-a)]/[sin(3π+a)+sin(a-π)】=
化简sin(A+π/4)sin(A-π/4)/sin^4A-cos^4A
化简sin(a-5π)cos(-π/2-a)cos(8π-a)/sin(a-3π/2)sin(-a-4π)
化简sin(a-5π)cos(-π/2-a)cos(8π-a)/sin(a-3π/2)sin(-a-4π)
sin(a-2π)sin(a+2π)-2cos(a-π|2)sin(a-π)-cos^(π|2+a) 化简
化简 sin(a-2π)sin(a+π)-2cos(a-π|2)sin(a-π)-cos^2(π|2+a)
化简sin(2π-a)sin(pai+a)cos(-π-a)/sin(3π-a)cos(π-a)
化简sin(4π-a)*sin(5π-a)=?