已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos
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已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a
已知tana=2
(1)sina+3cosa/sina-cosa
(2)sin²a+sinacosa+3cos²a
已知tana=2
(1)sina+3cosa/sina-cosa
(2)sin²a+sinacosa+3cos²a
(1)sina+3cosa/sina-cosa
=(tana+3)/(tana-1)
=(2+3)/(2-1)
=5
(2)sin²a+sinacosa+3cos²a
=(sin²a+sinacosa+3cos²a)/(sin²a+cos²a)
=(tan²a+tana+3)/(tan²a+1)
=(4+2+3)/(4+1)
=9/5
=(tana+3)/(tana-1)
=(2+3)/(2-1)
=5
(2)sin²a+sinacosa+3cos²a
=(sin²a+sinacosa+3cos²a)/(sin²a+cos²a)
=(tan²a+tana+3)/(tan²a+1)
=(4+2+3)/(4+1)
=9/5
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