化简:sin(a+5π)cos(-π/2-a)·cos(8π-a)/sin(a-3π)·sin(-a-4π)化简:sin(a+5π)cos(-π/2-a)·cos(8π-a)/sin(a-3π/2)·sin(-a-4π)

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化简:sin(a+5π)cos(-π/2-a)·cos(8π-a)/sin(a-3π)·sin(-a-4π)化简:sin(a+5π)cos(-π/2-a)·cos(8π-a)/sin(a-3π/2)·

化简:sin(a+5π)cos(-π/2-a)·cos(8π-a)/sin(a-3π)·sin(-a-4π)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)·sin(-a-4π)
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)·sin(-a-4π)化简:sin(a+5π)cos(-π/2-a)·cos(8π-a)/sin(a-3π/2)·sin(-a-4π)
sin(a+5π)=-sina,cos(-π/2-a)=cos(π/2+a)=-sina,cos(8π-a)=cosa;
sin(a-3π/2)=cosa,sin(-a-4π)=sina;
原式=(-sina)(-sina)cosa/(cosasina)=sina;