About Lesson
10.5 Graphical Solutions of Trigonometric Equations 三角方程式的图解法
(1) Sketch on the same diagram, the curves
and
for the interval
. State the number of solutions in the interval
of the equation
.





在同一个图,描曲线 和
当
. 试说明在
的区间方程式
有多少个解.
Answer :
4
(2) Sketch
and
for
and find the number of solution for
.




在中描
和
且求
有多少个实数解。
Answer :
6
(3) Find the number of solution for the equation
where
.


求在 中,
有多少个实数解。
Answer :
4
(4) Sketch the graph of
=
for
. By sketching a suitable straight line on the same diagram, find the number of solution for
+
=
.






描图 =
当
. 在同一个图描一适当的直线,求
+
=
有多少个实数解有多少个实数解。
Answer :
5
(5) Sketch the graphs of
such that
.
Hence, obtain the number of solutions of


Hence, obtain the number of solutions of

描图当
.
据此,找 有多少个实数解
Answer :
4