题目
Problem
A curve has equation y=2+3sin21x for 0≤x≤4π.
(a) State greatest and least values of y.
[2]
(b) Sketch the curve.
[2]
(c) State the number of solutions of the equation
2+3sin21x=5−2x
for 0≤x≤4π.
[1]
题目中文翻译
一条曲线的方程为 y=2+3sin21x,其中 0≤x≤4π。
(a) 写出 y 的最大值和最小值。
(b) 画出该曲线的草图。
(c) 写出方程
2+3sin21x=5−2x
在 0≤x≤4π 范围内的解的个数。
解答