cot^2x=2tan^2y+1 求sin^2y+2sin^2x
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cot^2x=2tan^2y+1 求sin^2y+2sin^2x
可以的话请写上过程
可以的话请写上过程
cot^2x=2tan^2y+1 ,
cot^2x+1=2tan^2y+2,
1/(sinx)^2=2/(cosy)^2,
(cosy)^2=2(sinx)^2,
1-(siny)^2=2(sinx)^2,
(siny)^2+2(sinx)^2=1.
cot^2x+1=2tan^2y+2,
1/(sinx)^2=2/(cosy)^2,
(cosy)^2=2(sinx)^2,
1-(siny)^2=2(sinx)^2,
(siny)^2+2(sinx)^2=1.
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