化简[tan(π+α)cos(π+α)sin²(3π+α)]/[tan²α*cos³(-π-α)]

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化简[tan(π+α)cos(π+α)sin²(3π+α)]/[tan²α*cos³(-π-α)]化简[tan(π+α)cos(π+α)sin²(3π+α)]/

化简[tan(π+α)cos(π+α)sin²(3π+α)]/[tan²α*cos³(-π-α)]
化简[tan(π+α)cos(π+α)sin²(3π+α)]/[tan²α*cos³(-π-α)]

化简[tan(π+α)cos(π+α)sin²(3π+α)]/[tan²α*cos³(-π-α)]
-π/3≤x≤π/3
同乘以2
-2π/3≤2x≤2π/3
同时加上π/6
-π/2≤2x+π/6≤5π/6
18×2÷(2+1)=12
18×1÷(2+1)=6
所以甲是12,乙是6

原式=[tanα(-cosα)sin²α]/[tan²α*(-cos³α)]
=sin²α/(tanαcos²α)
=tan²α/tanα
=tanα

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