sin(A+B)sin(A-B)为何可以化简为 -{cos^2(A)-cos^2(B)}?
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sin(A+B)sin(A-B)为何可以化简为 -{cos^2(A)-cos^2(B)}?
sin(A+B)sin(A-B)为何可以化简为 -{cos^2(A)-cos^2(B)}?
sin(A+B)sin(A-B)为何可以化简为 -{cos^2(A)-cos^2(B)}?
sin(A+B)sin(A-B)
=(sinAcosB+sinBcosA)*(sinAcosB-sinBcosA)
=(sinAcosB)^2-(sinBcosA)^2
=((sinA)^2)*(1-(sinB)^2)-((sinB)^2)*(1-(sinA)^2)
=(sinA)^2-(sinB)^2
“^”是次方的意思
“*”是乘号的意思
sin(a+b)sin(a-b)=((sina)*(cosb)+(sinb)*(cosa))((sina)(cosb)-(sinb)(cosb))=(公式(a+b)(a-b)=a-b
sin(A+B)sin(A-B)为何可以化简为 -{cos^2(A)-cos^2(B)}?
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