化简:sin(3a-TT)/sina+cos(3a-TT)/cosa

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化简:sin(3a-TT)/sina+cos(3a-TT)/cosa化简:sin(3a-TT)/sina+cos(3a-TT)/cosa化简:sin(3a-TT)/sina+cos(3a-TT)/co

化简:sin(3a-TT)/sina+cos(3a-TT)/cosa
化简:sin(3a-TT)/sina+cos(3a-TT)/cosa

化简:sin(3a-TT)/sina+cos(3a-TT)/cosa
sin(3a-TT)/sina+cos(3a-TT)/cosa
=(sin(3a-TT)cosa+cos(3a-TT)sina)/(sinacosa)
=sin(3a-TT+a)/sinacosa
=2sin(4a-TT)/sin2a

-4cos2a