(1-cosx)/(4+sin^2 x)=1/2
2-2cosx=4+sin²x=5-cos²x
即
cos²x-2cosx-3=0
解得
cosx=-1或cosx=3(舍去)
则sinx=0
(4+cos^2 x)(3+sin^2 x)
=(4+1)(3+0)
=15
(1-cosx)/(4+sin^2 x)=1/2
2-2cosx=4+sin²x=5-cos²x
即
cos²x-2cosx-3=0
解得
cosx=-1或cosx=3(舍去)
则sinx=0
(4+cos^2 x)(3+sin^2 x)
=(4+1)(3+0)
=15