sina/2-cosa/2=根5/5(a大于二分之派小于派)求sin asin(a/2)
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sina/2-cosa/2=根5/5(a大于二分之派小于派)求sin asin(a/2)
sina/2-cosa/2=根5/5(a大于二分之派小于派)求sin a
sin(a/2)
sina/2-cosa/2=根5/5(a大于二分之派小于派)求sin asin(a/2)
是(sina)/2还是sin(a/2)
[sin(a/2)-cos(a/2)]^2=1/5
1-sin a=1/5
sin a=4/5
[sin(a/2)-cos(a/2)]^2=(根5/5)^2
[sin(a/2)]^2+[cos(a/2)]^2-2sin(a/2)*cos(a/2)=1/5
1-sin a=1/5
sin a=4/5