y=((1-sin a)^2)/(sin a-(sin a)^2)不好意思,上面打错了,y=((1+sin a)^2)/(sin a-(sin a)^2)

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y=((1-sin a)^2)/(sin a-(sin a)^2)不好意思,上面打错了,y=((1+sin a)^2)/(sin a-(sin a)^2)

y=((1-sin a)^2)/(sin a-(sin a)^2)不好意思,上面打错了,y=((1+sin a)^2)/(sin a-(sin a)^2)
y=((1-sin a)^2)/(sin a-(sin a)^2)
不好意思,上面打错了,y=((1+sin a)^2)/(sin a-(sin a)^2)

y=((1-sin a)^2)/(sin a-(sin a)^2)不好意思,上面打错了,y=((1+sin a)^2)/(sin a-(sin a)^2)
y=(1-sina)²/[sina(1-sina)]
=(1-sina)/sina
=(1/sina)-1
分母不等于0
所以1-sina≠0
所以-1

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