求值,三角函数log2(cos20)+log2(cos40)+log2(cos80)
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求值,三角函数
log2(cos20)+log2(cos40)+log2(cos80)
log2(cos20)+log2(cos40)+log2(cos80)
![求值,三角函数log2(cos20)+log2(cos40)+log2(cos80)](/uploads/image/z/19095679-55-9.jpg?t=%E6%B1%82%E5%80%BC%2C%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0log2%EF%BC%88cos20%EF%BC%89%2Blog2%EF%BC%88cos40%EF%BC%89%2Blog2%EF%BC%88cos80%EF%BC%89)
原式=log2(cos20cos40cos80)
=log2(2sin20cos20cos40cos80/2sin20)
=log2(sin40cos40cos80/2sin20)
=log2(sin80cos80/4sin20)
=log2(sin160/8sin20)
=log2(sin20/8sin20)
=log2(1/8)
=-3
=log2(2sin20cos20cos40cos80/2sin20)
=log2(sin40cos40cos80/2sin20)
=log2(sin80cos80/4sin20)
=log2(sin160/8sin20)
=log2(sin20/8sin20)
=log2(1/8)
=-3
log2分之1(底数)4(是真数)求值
解不等式:|log2(x-1)|+log2(5-x)
log2(1001)等于多少
log2(√1/48)+log2 12-1/2log2 (24)-1/3
Log2√(7/48) +log2 12 -(1/2)log2 42
高一数学必修4题化简(1)cos72*cos36(2)cos20*cos40*cos60*cos80(3)sin6*si
求值:【sin50°[1+根号(3)tan10°]—cos20°】/[cos80°根号(1—cos20°)】
【跪求】【求值】(sin50(1+根号(3)*tan10)-cos20)\(根号(2)*cos80*sin10)
log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2[log
比较大小 log2(3)log3(4)
证明不等式log2(3)>log3(4)
log2(x^2)=2x