tan a =3求4sin a-2cos a/5cos+3sin a

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tana=3求4sina-2cosa/5cos+3sinatana=3求4sina-2cosa/5cos+3sinatana=3求4sina-2cosa/5cos+3sina4sina-2cosa/5

tan a =3求4sin a-2cos a/5cos+3sin a
tan a =3求4sin a-2cos a/5cos+3sin a

tan a =3求4sin a-2cos a/5cos+3sin a
4sin a-2cos a/5cos+3sin a
=cosa(4tana-2)/cosa(5+3tana)
=(4*3-2)/(5+3*3)
=10/14
=5/7