asinπ/4-bcosπ/4=√2/2(a-b)为什么asinπ/4-bcosπ/4=√2/2(a-b)

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asinπ/4-bcosπ/4=√2/2(a-b)为什么asinπ/4-bcosπ/4=√2/2(a-b)
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asinπ/4-bcosπ/4=√2/2(a-b)为什么asinπ/4-bcosπ/4=√2/2(a-b)
asinπ/4-bcosπ/4=√2/2(a-b)
为什么asinπ/4-bcosπ/4=√2/2(a-b)

asinπ/4-bcosπ/4=√2/2(a-b)为什么asinπ/4-bcosπ/4=√2/2(a-b)
sin(π/4)=cos(π/4)=√2/2
所以 asinπ/4-bcosπ/4=√2/2(a-b)