1. In a MC question, the graph y = sinx is given, how can we know the number of root in 6sinx - x/50?
2. How many root in 2tanx = sinx is 0<= x<=360? ans: 2
3. If u are using Exploring Mathematics Book 4B, wt is the solution of P.141 20b 3?
3 Maths problems
2008-06-15 2:08 am
回答 (1)
2008-06-15 3:41 am
✔ 最佳答案
2tanx = sinx2sinx=sinxcosx
2sinx-sinxcosx=0
sinx(2-cosx)=0
sinx=0 or cosx=2(Reject)
x=0˚ ,180˚ or 360˚
In 0<= x<=360 ,I think ANS is 3 root!
收錄日期: 2021-04-23 20:41:10
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