若tan2a=2,则cos(3π/2+2a) / cos(3π/2-a)cos(a-3π/2) =______?
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若tan2a=2,则cos(3π/2+2a) / cos(3π/2-a)cos(a-3π/2) =______?
![若tan2a=2,则cos(3π/2+2a) / cos(3π/2-a)cos(a-3π/2) =______?](/uploads/image/z/18992090-2-0.jpg?t=%E8%8B%A5tan2a%3D2%2C%E5%88%99cos%283%CF%80%2F2%2B2a%29+%2F+cos%283%CF%80%2F2-a%29cos%28a-3%CF%80%2F2%29+%3D______%3F)
若tan2a=2,则
cos(3π/2+2a) / sin(3π/2-a)cos(a-3π/2)
=sin2a / cosasina
=2sin2a /sin2a
=2tan2a
=4
cos(3π/2+2a) / sin(3π/2-a)cos(a-3π/2)
=sin2a / cosasina
=2sin2a /sin2a
=2tan2a
=4
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